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• 10,000 Year Clock, United States of America
• Underground Project 131, China
• 19-Lachter-Stollen, Germany
• 816 Military Nuclear Plant, China
• Aachquelle, Germany
• Aareschlucht, Switzerland
• Abaligeti-barlang, Hungary
• Abano Mineral Lake Natural Monument, Georgia
• Museo Minerario di Abbadia San Salvatore, Italy
• Furna do Abel, Portugal
• Abercrombie Caves, Australia
• Abime, Belgium
• Abismo Anhumas, Brazil
• Abismo Oscuro, Costa Rica
• Cueva del Abra, México
• Abraham's Cave, Turkey
• Abrakurrie Cave, Australia
• Abukuma-do, Japan
• Abu Simbel, Egypt
• Caves Ackerman, France
• Grotta di Acquasanta, Italy
• Actun Kan Cave, Guatemala
• Adjimushkay Quarries, Russia
• Admiral's Cave, Bermuda
• Adršpašsko-teplické skály, Czech Republic
• Cueva de Adsubia, Spain
• Adventure Copper Mine, United States of America
• Afawa Cave, Papua New Guinea
• Magharet Afqua, Lebanon
• Aggertalhöhle, Germany
• Saint Barbara Cave Church, Cyprus
• Spilia Agia Paraskevi - Aghia Paraskevi Cave, Greece
• Agia Paraskevi, Greece
• Spilea Agia Sophia - St Sophia's Cave (Kythira), Greece
• Spilea Agia Sophia - St Sophia's Cave (Crete), Greece
• Spilia Agio Gala, Greece
• Spilaio to Agiou Antoniou, Greece
• Spilaio Agios Georgios, Greece
• Agios Georgios Mandelas's Cave, Greece
• Iepa Moni Agios Gerasimos, Greece
• Spilia Ag Ioánnis Erimitis - Hermits' Cave of Saint John, Greece
• Spilia Áyios Ioánnis Iráklia, Greece
• Spilia O'Ag Ioannis Kastro - St John's Hermit Cave, Greece
• Spilaio Agios Mamas - Agios Mamas Cave, Greece
• Agios Spyridon, Cyprus
• The Glittering Caves of Aglarond, Middle-Earth
• A GoGo Valkenburg, Netherlands
• Cueva del Agua, Spain
• Agua Azul, México
• Caverna Água Suja, Brazil
• Grutas del Águila, Spain
• Gruta das Agulhas, Portugal
• Les grottes de l'Aguzou, France
• Aihole, India
• Aillwee Cave, Ireland
• Ain Wazein Cave, Lebanon
• Aitiks Koppargruva, Sweden
• Aitzulo, Spain
• Ajanta Caves, India
• Ajkai Bányászati Múzeum, Hungary
• Akarsu Köyü Mağarası, Turkey
• Akasaki shonyudo, Japan
• Akhshtyrskaya Cave, Russia
• Akiyoshi-do, Japan
• Akka-do, Japan
• Akköy Evleri, Turkey
• Aktun Chen, México
• Cenote Aktun Ha, México
• Alabama Mining Museum, United States of America
• Alabaster Caverns State Park, United States of America
• Gruta Alambari de Baixo, Brazil
• Cuevas Pedro Antonio de Alarcón, Spain
• Alayan-Lion Cave System, Philippines
• Pestera Albastra, Romania
• Gole dell'Alcantara, Italy
• Gruta das Alcobertas, Portugal
• Al-Daher Cave, Jordan
• Magh?rat al-Dam, Syria
• Magharet Al Dawwayat, Syria
• Grotte d'Aldène, France
• Aldrich Coal Mine Museum, United States of America
• Aleksandrovo Thracian Tomb, Bulgaria
• Alepotrypa, Greece
• Alexander's Cave Houses, Greece
• Alexander Caverns, United States of America
• Alexandra Cave, Australia
• Al Fayah Park, United Arab Emirates
• Museo dei Minerali Elbani "Alfeo Ricci", Italy
• Alfina Hotel, Turkey
• Al Hotta Cave, Oman
• Aliança Underground Museum, Portugal
• Ali Barbour's Cave, Kenya
• Alikadam Cave, Bangladesh
• Ghar-e-Ali Sadr, Iran
• Spilaio Alistratis - Alistrati Cave, Greece
• Aljibe Andalusí, Spain
• Parque Mineiro De Aljustrel, Portugal
• Al Kittan, Oman
• Allander Tropfsteinhöhle, Austria
• Allikukivi Caves, Estonia
• Sinkgruvene i Allmannajuvet, Norway
• Cueva de Almendras, Perú
• Almond Valley Heritage Centre, Great Britain
• Alofaaga Blowholes, Samoa
• Jebal Al Qarah, Saudi Arabia
• Altamira, Spain
• Piatra Altarului, Romania
• Salzbergwerk Altaussee, Austria
• Besucherbergwerk Alte Hoffnung Erbstolln, Germany
• Bergbaumuseum Altenberg, Germany
• Altensteiner Höhle, Germany
• Alter Elbtunnel, Germany
• Altinbesik Mağarası, Turkey
• Altinocak Restaurant, Turkey
• Cueva de Altxerri, Spain
• Alufu Dong, China
• Alutila Cave, Bangladesh
• Alux Restaurant & Lounge, México
• Grutas de Alvados, Portugal
• Alvensleben-Stollen, Germany
• Nascentes do Alviela, Portugal
• Amano Yasugawara, Japan
• Amarnath Cave, India
• Schaubergwerk Am Aschenberg, Germany
• Mapango ya Amboni - Amboni Caves, Tanzania
• Åmdals Verk Gruver, Norway
• American Cave Museum, United States of America
• Velká Amerika, Czech Republic
• Stollnsystem »Am Graben«, Germany
• Ami Chenin, France
• Amir Chakhmaq Complex, Iran
• Amlwch Copper Kingdom, Great Britain
• Tuffière d´Amorey, France
• Amos Rex, Finland
• Ampanito Valakely, Madagascar
• Anakami shonyudo, Japan
• Ananui Cave, New Zealand
• Anapala Chasm, Niue
• Anatola Cave, Niue
• Anatolian Houses, Turkey
• Anchor Church Cave, Great Britain
• Andersgrotta, Norway
• Andreas-Gegentrum-Stolln, Germany
• Banské múzeum štôlňa Andrej, Slovakia
• Anemone Cave, United States of America
• Spilaio Anemotrypa, Greece
• Bīr al-Anezīya, Israel
• Cenote Angelita, México
• Grotta dell'Angelo, Italy
• Animal Flower Cave, Barbados
• Grotte d'Anjohibe, Madagascar
• Anlage Mitte, Poland
• Anna Barlang, Hungary
• Grube Anna-Elisabeth, Germany
• Ansite, Spain
• Antelope Canyon, United States of America
• Pavilon Anthropos, Czech Republic
• Cuevas de la Antigua Fragua, Spain
• Antiparos, Greece
• Antonijev Rov, Slovenia
• Antonio Pereira Imperial Topaz Mine, Brazil
• Cueva de Anzo, Spain
• Aoiwa shonyudo, Japan
• Ape Cave, United States of America
• Apedale Mine, Great Britain
• Appalachian Caverns, United States of America
• Aquinaldo Cave, Philippines
• La Caune de l'Arago, France
• Aranui Cave, New Zealand
• Saline Royale d'Arc-et-Senans, France
• Arch Cave, Canada
• Arches National Park, United States of America
• El Arco del Tiempo del Río La Venta, México
• Arco Naturale, Italy
• Kaivosyhtiö Arctic Ametisti Oy, Finland
• Grotte D'Arcy, France
• Cueva de Ardales, Spain
• La Cuevona de Ardines, Spain
• Minas de Arditurri, Spain
• Ardlair Cave, Great Britain
• Ardoisalle 1947, Belgium
• La grotta delle Arene Candide, Italy
• Gorges de l'Areuse, Switzerland
• Cluzeaux d'Argentine, France
• Miniere di Argento Vivo, Italy
• Argo Gold Mill and Museum, United States of America
• Argyle Diamond Mine, Australia
• Arigna Mining Experience, Ireland
• Arizona Mining and Mineral Museum, United States of America
• Arjeri, Armenia
• Arjun Gufa, India
• Arkasu Mağarası, Turkey
• Aven Armand, France
• Arndthöhle, Germany
• Arnhem Cave, Namibia
• Historische Kelders Arnhem, Netherlands
• Arnold Ice Cave, United States of America
• Arochukwu Cave, Nigeria
• Caverna Aroe Jari, Brazil
• Parque Natural da Arrábida, Portugal
• Arroyo Tapiado Mud Caves, United States of America
• La Grotta dell' Arsenale, Italy
• Coves de Artá, Spain
• Museo dell'Arte Mineraria, Italy
• Cave Village Artenara, Spain
• Schaubergwerk Arthurstollen, Austria
• Artlish River Cave, Canada
• Aruküla Caves, Estonia
• Schau- und Lehrstollen Arzberg, Austria
• Arzberghöhle, Austria
• Asbestos Mineral Museum, Canada
• 'Ashabi Alkahf, Jordan
• Ashabi Kahf, Azerbaijan
• Ashab-ı Kehf Mağarası, Turkey
• Ashio Copper Mine, Japan
• Askola Potholes, Finland
• Brachoskepi Asprochaliko, Greece
• Historisches Dachschieferbergwerk Assberg, Germany
• Forschungsbergwerk Asse, Germany
• Astana Underground Museum, China
• Astley Green Colliery Museum, Great Britain
• L'Astore Masseria, Italy
• Ataman Hotel, Turkey
• Atapuerca, Spain
• Atea Kananda, Papua New Guinea
• Grutas de Atepolihui, México
• Atlantida, Ukraine
• Atlantikwall, France
• Atlas Coal Mine National Historic Site, Canada
• Atomkeller, Germany
• The Treasury of Atreus, Greece
• Attahöhle, Germany
• La Carrière d'Aubigny, France
• Grotte des Audides, France
• Auerbachs Keller, Germany
• Musée des Mines de Fer d'Aumetz, France
• Auracher Löchl, Austria
• Aurangabad Caves, India
• Aurora Erbstolln, Germany
• Cueva del Cerro Autana, Venezuela
• Aux Vieux Logis, France
• Avaiki, Niue
• Avan Mine, Armenia
• Cueva de los Aviones, Spain
• Ayala Disco, Cuba
• Ayia Napa Sea Caves, Cyprus
• Ayias Solomonis Cave Church and Catacombs, Cyprus
• Ayia Thekla Cave Church, Cyprus
• Ayioi Saranta Cave Church, Cyprus
• Ayios Sozomenos Cave Church, Cyprus
• Ayo Rocks, Aruba
• Ayvaini Mağarası, Turkey
• Grotte d'Azé, France
• Grotte du Mas-d'Azil, France
• Pozo Azul, Spain
• Cenote Azul, México
• Poço Azul, Brazil
• Grotta Azzurra, Italy
• Höllgrotten Baar, Switzerland
• Baatara Cave, Lebanon
• Jama pod Babjim zobom, Slovenia
• Gruta do Bacaetava, Brazil
• Bachelor-Syracuse Mine Tour, United States of America
• Bacho Kiro, Bulgaria
• Badami Cave Temple, India
• Kurzentrum Bad Bleiberg, Austria
• Badger Mine and Museum, United States of America
• Baekryong Donggul, South Korea
• Bärenhöhle, Germany
• Bärenhöhle, Germany
• Bärenschützklamm, Austria
• Bagdad Mine, United States of America
• Bag End, Middle-Earth
• Baggehola, Norway
• Bagh Caves, India
• Miniera della Bagnada, Italy
• Bagshawe Cavern, Great Britain
• Bahay Paniki Cave, Philippines
• Bailong Dong, China
• Baima Dong, China
• Bái Ma Jiàng Jun Dòng, China
• Baimo Cave, China
• Bainiao Cave, China
• Baixiangdong, China
• Bakhardenskaya Cave, Turkmenistan
• Balaclava Mine, Australia
• Naval Museum Complex Balaklava, Russia
• Miniera di Amianto di Balangero e Corio, Italy
• Gruta de Balankanché, México
• Balatoc Mines Tour, Philippines
• Jeskyne Balcarka, Czech Republic
• Bald Hill Mine, Australia
• Balek Sulfur Caves, Papua New Guinea
• Ballica Magarasi, Turkey
• The Ballroom, New Zealand
• Grottenburg Balm, Switzerland
• Grottes de la Balme, France
• Baloc-Baloc Cave, Philippines
• Balsbergsgrottan, Sweden
• Balver Höhle, Germany
• Grotte di Balzi Rossi, Italy
• Bā mǎ dòngtiānfúdì, China
• Bamei Polje, China
• Baňa Cígeľ, Slovakia
• Banbury Tourist Mine, New Zealand
• Bandelier, United States of America
• Bandiagara Escarpment, Mali
• Bănița Gorge, Romania
• Banjaran Hotsprings Retreat, Malaysia
• Banská Štiavnica, Slovakia
• Banwell Bone Caves, Great Britain
• Grotte de Bara-Bahau, France
• Barabar Caves, India
• Baračeve špilje, Croatia
• Baradla Barlang, Hungary
• Baranca Sunu Grot, Aruba
• Barbarastollen, Germany
• Barbarossahöhle, Germany
• Jama Baredine, Croatia
• Bari Imam Cave, Pakistan
• Barry troglodyte village, France
• Bartholomäberg, Austria
• Barton Creek Cave, Belize
• Basaltkeller, Germany
• Basarbovo Cave Monastery, Bulgaria
• Basiliani Hotel, Italy
• Bastnäsfältet, Sweden
• Bat Cave, United States of America
• Bat Cave, Cayman Islands
• Bat Cave, Canada
• Bat Cave Mine, United States of America
• Bates Cave, Australia
• Bathala Caves, Philippines
• Bat Cave, Saint Kitts and Nevis
• Bat Cave, Montserrat
• Battery Hill, Australia
• Battle of Britain Control Room, Great Britain
• Batu Caves, Malaysia
• Gua Batu Maloi, Malaysia
• Baumannshöhle, Germany
• Bava Pyara Caves, India
• Bayin Nyi Cave, Myanmar
• BC Museum of Mining, Canada
• Beaconsfield Mine and Heritage Centre, Australia
• Beamish, Great Britain
• Bear Cave, United States of America
• Grotte di Beatrice Cenci, Italy
• St. Beatushöhlen, Switzerland
• Grotte de Beaume Obscure, France
• Grotte de Beaussac, France
• Beckham Creek Cave Haven, United States of America
• Beckley Exhibition Coal Mine, United States of America
• Grotte du Bédat, France
• Grotte de Bédeilhac, France
• Bedsa Caves, India
• Beer Quarry Caves, Great Britain
• Grottene i Beiarn, Norway
• Beit She'arim National Park, Israel
• Béke-barlang, Hungary
• Bekiris Cave, Greece
• Cueva de Belda, Spain
• Beldibi Magarasi, Turkey
• Belianska Jaskyna, Slovakia
• Bell Caves, Israel
• Cuevas de Bellamar, Cuba
• Orrido di Bellano, Italy
• Les grottes de Bellevue, France
• Bellevue Underground Mine Tour, Canada
• Bellingham Heritage Centre, Great Britain
• Bell Island's Mine Museum and Underground Tour, Canada
• Bellony Cave, Haiti
• Bell Witch Cave, United States of America
• Cueva de Belmaco, Spain
• Belum Caves, India
• Grotte di Belverde, Italy
• Tsingy de Bemaraha, Madagascar
• Ben's Cave, Bahamas
• Algar de Benagil, Portugal
• Grotte des ain Beni Add, Algeria
• Cuevas de Benifallet, Spain
• La Cueva de Ben Loman, Belize
• Benshan Fifth Tunnel, China
• Benshoof Cistern Museum, Israel
• Benxi Water Cave, China
• Beppu Benten Pond, Japan
• Erlebnisbergwerk Berchtesgaden, Germany
• Heilstollen Berchtesgaden, Germany
• Südtiroler Bergbaumuseum, Italy
• Le vieux Berger, France
• Beringer Vineyards, United States of America
• Berkeley Pit, United States of America
• Berliner Unterwelten, Germany
• Caves Bernard-Massard, Luxembourg
• Grottes de Bernifal, France
• Bernsteiner Felsenmuseum, Austria
• Berry Springs, Australia
• Bersham Colliery, Great Britain
• Bertrix Slate Mine, Belgium
• Besucherbergwerk Bertsch, Germany
• Grottes de Betharam, France
• Bethlehem Cave, United States of America
• Eiskeller der Brauerei Beuing, Germany
• Beulah Mine, United States of America
• Gua Bewah, Malaysia
• Saarländisches Bergbaumuseum Bexbach, Germany
• Parc archéologique de Beynac, France
• Les Grottes de Bèze, France
• Bezeklik Thousand Buddha Caves, China
• Bhaja Caves, India
• Bhalil Cave Dwellings, Morocco
• Bhartrihari Caves, India
• Bhimbetka, India
• Patal Bhuvaneshvar, India
• Bicchu-Kanachi ana, Japan
• Big Basin, United States of America
• Big Bone Cave, United States of America
• Big Brutus, Inc., United States of America
• Big Four Ice Caves, United States of America
• Big Ice Cave, United States of America
• Big Nugget Mine, United States of America
• Big Opal Mine, Australia
• Big Pit, Great Britain
• Big Spring, United States of America
• Pecina Bijambare - Bijambare Cave, Bosnia and Herzegovina
• Bilsteinhöhlen, Germany
• Bilzingsleben, Germany
• Bimmah Sinkhole, Oman
• Binbirdirek Sarnıçı, Turkey
• Besucherbergwerk Grube Bindweide, Germany
• Binghöhle, Germany
• Bingag Cave, Philippines
• Binġemma, Malta
• Bingham Canyon Mine, United States of America
• Bird's Botanicals, United States of America
• Birkhill Caverns Clay Mine, Great Britain
• Birresborner Eishöhlen, Germany
• Špilja Biserujka, Croatia
• Izviri v Bistri, Slovenia
• Citadelle de Bitche, France
• Biyundong, China
• Gruvmuseet Bjuv, Sweden
• Blaafarveværket, Norway
• Blaauwbank Historic Gold Mine, South Africa
• Black Buddha Cave, China
• Black Chasm, United States of America
• Black Country Living Museum, Great Britain
• Black Hills Caverns, United States of America
• Black Hills Mining Museum, United States of America
• Black Hole, Bahamas
• Blair Athol Coal Mine, Australia
• Blair Street Underground Vaults, Great Britain
• Blanchard Springs Caverns, United States of America
• Blanche Cave, Australia
• Jeskyně Blanických rytířů, Czech Republic
• Grotte de Blanot, France
• Musée de la Mine de Blanzy, France
• Blaue Quelle, Austria
• Blauer See, Germany
• Blautopf, Germany
• Cova Blava, Spain
• Błędne Skały, Poland
• Blegny, Belgium
• Grube Neue Hoffnung Bleialf, Germany
• Bletterbachschlucht, Italy
• Source Bleue, France
• La Mine Bleue, France
• Bloomington Cave, United States of America
• Il-Hnejja, Malta
• Blue Hole, Egypt
• Blue Creek Cave, Belize
• Blue Eye, Cabo Verde
• Blue Hills Tin Streamers, Great Britain
• Blue Hole, Belize
• Blue Hole Spring, United States of America
• Blue Hole, Jamaica
• Blue Hole Mineral Spring, Jamaica
• Blue John Cavern, Great Britain
• Blue Lagoon, Jamaica
• Blue Lake Rhino Cave, United States of America
• Bluespring Caverns, United States of America
• Bluff Dweller's Cave and Browning Museum, United States of America
• Blyde River Canyon, South Africa
• Bnei Hezir, Israel
• Board Camp Crystal Mine, United States of America
• Toca da Boa Vista, Brazil
• Bobby Dazzler Walk-in Mine, Australia
• Boca Tabla Cave, Curaçao
• Uzdrowisko Kopalnia Soli, Poland
• Les casemates du Bock, Luxembourg
• Bocksteinschmiede, Germany
• Bodagrottorna, Sweden
• Bodås gruva, Sweden
• Bodenloses Loch, Germany
• Silberberg Bodenmais, Germany
• Pesterna Crkva Sveta Bogorodica, Macedonia
• Ecomusée du Bois-du-Luc, Belgium
• Mineralogické a Banícke Múzeum Bojnice, Slovakia
• Bojnická Jeskyne, Slovakia
• Boka, Slovenia
• Bergrum Boliden, Sweden
• Peștera Bolii, Romania
• Bollinger, France
• Bol'shaya Azishskaya Cave, Russia
• Bom Jesus da Lapa, Brazil
• Bon Accord Mine Complex, Australia
• Bo Nau Cave, Vietnam
• Bondstollen Kopparberg, Sweden
• Bone Cave, Great Britain
• Bong Mieu Gold Mine, Vietnam
• Cueva Bonita, Spain
• Bonnechere Caves, Canada
• Bonne Terre Mine, United States of America
• Boone's Cave State Park, United States of America
• Cavernas El Boquerón, Honduras
• Muzej Rudarstva i Metalurgije Bor, Serbia
• Border Cave, South Africa
• Borenore Caves, Australia
• Grotte Di Borgio Verezzi, Italy
• Il Borgo Ritrovato, Italy
• Tham Borichinda, Thailand
• Hessisches Braunkohle Bergbaumuseum Borken, Germany
• Borra Caves, India
• Pętla Boryszyńska, Poland
• Grotte du Bosc, France
• Bosc de Fades Bar, Spain
• Grotta di Bossea, Italy
• Bottini, Italy
• Gruta de Botuverá, Brazil
• Boulder Caves, United States of America
• Boulder Cave, United States of America
• Bounce Below, Great Britain
• Grotte de Bournillon, France
• Les Caves Bouvet-Ladubay, France
• Les Boves, France
• Tham Bo Ya, Thailand
• Boyd Cave, United States of America
• Boyden Cavern, United States of America
• Bozkovske Dolomitove jeskyne, Czech Republic
• Bracken Bat Cave, United States of America
• Abime de Bramabiau, France
• Parcours troglodytique de l'Abbaye de Brantôme, France
• Musée de la Mine Brassac les Mines, France
• Amphitheater Breechkaul, Luxembourg
• Breitachklamm, Germany
• Brenztopf, Germany
• Brestovská jasky?a, Slovakia
• Dalen-Kjørholt Gruve, Norway
• Château de Brézé, France
• Hornické Muzeum, Czech Republic
• Bridal Cave and Thunder Mountain Park, United States of America
• Brighton's Victorian Sewer, Great Britain
• Brillenhöhle, Germany
• Brimble Pit and Cross Swallet Basins, Great Britain
• Bristol Caverns, United States of America
• Muzeum brněnského podzemí, Czech Republic
• Brněnská kostnice, Czech Republic
• Broken Boot Gold Mine, United States of America
• Schaustollen Silberbergwerk Bromriesen, Austria
• Bronson Caverns, United States of America
• Brotherhood Winery, United States of America
• Broumovské stěny, Czech Republic
• Bruce's Cave, Ireland
• Bruce's Cave, Great Britain
• Bruce Peninsula Grotto, Canada
• Bruce's Caves, Canada
• Wiarton's Hermit, Canada
• Brünig Indoor Schiess-Sport-Zentrum, Switzerland
• Caverna de las Brujas, Argentina
• Las Cuevas de las Brujas, Spain
• Bruneckerhöhle, Austria
• Campement préhistorique de Bruniquel, France
• Brunner Mine, New Zealand
• Brunnsteinhöhle, Germany
• Brunson Instrument Company, United States of America
• Miniera d'Oro di Brusson, Italy
• Bryce Canyon, United States of America
• Bunker B-S 8 Hřbitov, Slovakia
• Bua Tong, Thailand
• Buchenlochhöhle, Germany
• Höhlenburg Buchfart, Germany
• Quarzsandbergwerk im Krähstel, Switzerland
• Schaubergwerk Büchenberg, Germany
• Grotta di Bue Marino, Italy
• Buenavista Cave, Philippines
• Buffalo National River, United States of America
• Buffalo Bayou Park Cistern, United States of America
• Bugasan Cave, Philippines
• Kalimuseum Buggingen, Germany
• Bukilat Cave, Philippines
• Bulla Regia, Tunisia
• Bullers of Buchan, Great Britain
• Bullock Creek Sinks, New Zealand
• Bull Shoals Caverns, United States of America
• Bultfontein Mine, South Africa
• Izvor Buna, Bosnia and Herzegovina
• Bundesbank-Bunker, Germany
• Atombunker der Bundesregierung, Germany
• Bunkeri, Croatia
• Bunkermuseum Emden, Germany
• Bunkermuseum Hamburg, Germany
• Bunkermuseum Rennsteig, Germany
• Buraco das Araras, Brazil
• Furna do Buraco do Padre, Brazil
• Besucherbergwerk Burgbergstollen, Germany
• Travertine of Burgtonna, Germany
• Burke's Luck Potholes, South Africa
• Burra Monster Mine, Australia
• Burrows' Cave, United States of America
• Bushmans Kloof, South Africa
• The Caves of the Bussento River, Italy
• Grutas de Bustamante, México
• Butterfly Cave, China
• Cueva del Buxu, Spain
• Buynovsko Zhdrelo, Bulgaria
• Buzluk Mağarası, Turkey
• Old Bwana Mukubwa Tourism Centre, Zambia
• Byakuren-do, Japan
• Jeskyně Býčí skála, Czech Republic
• Byron Glacier Ice Caves, United States of America
• Bystrianska Jaskyna, Slovakia
• Cuevas las Cabachuelas, Puerto Rico
• Cuevas de Cabarete, Dominican Republic
• Cabinet War Rooms, Great Britain
• Gouffre Géant de Cabrespine, France
• Grutas de Cacahuamilpa, México
• Cacupangan Cave, Philippines
• Museu Mina Modelo Caetano Sonego, Brazil
• Café in the Crypt, Great Britain
• Grotte del Caglieron, Italy
• Musée de la Mine Cagnac les Mines, France
• Manoir de la Caillère, France
• Cala Covas, Spain
• Cova Cala Varques, Spain
• Cenote Calavera, México
• Cueva de las Calaveras, Spain
• Calbiga Caves, Philippines
• Calcata Cave Houses, Italy
• Calcehtok Cave, México
• Miniera di Calceranica, Italy
• Caldecotte Project, Great Britain
• Caledonia Copper Mine, United States of America
• Grottes de Calès, France
• Caleta Negra, Spain
• Calgardup Cave, Australia
• California Caverns, United States of America
• Çalköy Mağarası, Turkey
• Callao Cave, Philippines
• Għar Calypso, Malta
• Cameron Cave, United States of America
• Grotta del Cammello, Italy
• Cammoo Cave, Australia
• Camooweal Caves National Park, Australia
• Cuevas de Campanet, Spain
• Covolo di Camposilvano, Italy
• Les Canalettes, France
• Cuevas del Canelobre, Spain
• Canard Duchene, France
• Canashito Grot, Aruba
• Candelaria Caves, Guatemala
• Grotta del Cane, Italy
• Cango Caves, South Africa
• Gruta de las Canicas, México
• Cova de Can Marçà, Spain
• Cantabon Cave, Philippines
• Museo del Cantero, Spain
• Capão Mine, Brazil
• Abri Préhistorique du Cap Blanc, France
• Cape Breton Miners' Museum, Canada
• Capelton Mines, Canada
• Musée de la Mine de Cap Garonne, France
• Capigtan Cave, Philippines
• Museo delle Miniere di Capoliveri, Italy
• Cappadocia Cave Suites, Turkey
• Cappadocia Palace, Turkey
• Cappadocia Cave Resort & Spa, Turkey
• Catacombe dei Cappuccini, Italy
• El Búnker del Capricho, Spain
• La Cueva Caprichosa, Spain
• Capricorn Caves, Australia
• Gorges de Carança, France
• Carbonate Mine, United States of America
• Grotte des Carbonnières, France
• Grotta di Carburangeli, Italy
• Muntanya de Sal a Cordona, Spain
• Carey's Cave, Australia
• Gruta de Carlos Pacheco, México
• Carlotta Arch, Australia
• Carlsbad Caverns, United States of America
• Carmel National Nature Reserve, Great Britain
• Carnglaze Slate Caverns, Great Britain
• Carolinen Grube, Germany
• Grottes de Carpe Diem, France
• Carran Turlough, Ireland
• Musée du Carreau Wendel, France
• Carreg Cennen Castle Caves, Great Britain
• Cartwright's Cave, Bahamas
• Cartwright Duho Cave, Bahamas
• Algar do Carvão, Portugal
• Museu Estadual do Carvão, Brazil
• Gruta do Carvão, Portugal
• Carver's Cave, United States of America
• La Casa di Lucio, Italy
• Cascade Caverns, United States of America
• Cascade Cavern, United States of America
• Cascade des Tufs, France
• Parque da Cascata, Brazil
• Casibari Rocks, Aruba
• Casino Keller, Austria
• Cueva de Castañar, Spain
• Souterrain médiéval du Castela, France
• Grotta di Castelcivita, Italy
• Grotta di Castellana, Italy
• Grotta di Castello Tesino, Italy
• Castle Cave, Australia
• Castle Dome Mine Museum, United States of America
• Catacombe Roma - The Catacombs of Rome, Italy
• The Catacombs of Paris, France
• Cataviña, México
• Grutas de la Catedral, México
• Besucherbergwerk Grube Catharina Neufang, Germany
• Cathedral Cave, United States of America
• Cathedral Caves, New Zealand
• Cathedral Cave, Great Britain
• Cathedral Cave, Bermuda
• Cathedral Cave, Australia
• Cathedral Gorge, Australia
• The Cathedral, Bahamas
• Cathedral Caverns, United States of America
• Cathedrale d'Images, France
• Les Cathédrales de la Saulaie, France
• Cat Hole Cave, Great Britain
• Grotta del Caudano, Italy
• Giant's Causeway, Ireland
• Cava 177, Italy
• Grotta del Cavallone, Italy
• Furnas do Cavalum, Portugal
• Cave-in-Rock State Park, United States of America
• Cave and Basin, Canada
• Cave Creek, New Zealand
• Cave Creek Museum, United States of America
• Cave Garden, Australia
• Cave Hill, Ireland
• Caveman Bar-BQ & Steak House, United States of America
• Cave of the Winds, United States of America
• Caveoso Hotel, Italy
• Cave des Producteurs de Montlouis, France
• Cave River Park, United States of America
• Cavern Club, Great Britain
• Cavern Lake Cave, United States of America
• Caves Branch Jungle Lodge, Belize
• Cave Spring, United States of America
• Cave Spring Historic Site & Nature Center, United States of America
• Cave Spring Caverns, United States of America
• Cave Spring, United States of America
• Cave Stream, New Zealand
• Cave Vineyard, United States of America
• Centro di Documentazione delle Miniere di Lignite, Italy
• Cayman Crystal Caves, Cayman Islands
• Roc de Cazelle, France
• Bois du Cazier, Belgium
• Cedar Creek Springs, United States of America
• Cefn Coed Colliery Museum, Great Britain
• Cehennemağzi Mağarası, Turkey
• Cennet Adası Mağarası, Turkey
• Cennet ve Cehennem, Turkey
• Cenobio de Valerón, Spain
• Cenotillo, México
• Centaur's Cave, Antigua & Barbuda
• Gruta do Centenário, Brazil
• Center Mine, United States of America
• Cento Pozzi, Italy
• Centralia Burning Coal Mine, United States of America
• Jenolan Caves - Cerberus Cave, Australia
• Museu de les Mines de Cercs, Spain
• Grotte du Cerdon, France
• Ceremosnja Pecina, Serbia
• Gua Cerita, Malaysia
• Cerknisko Jezero, Slovenia
• Cerme Cave, Indonesia
• Cerovačke špilje, Croatia
• Cavernas del Viejo Volcan Parque Cerro Leones, Argentina
• Grafitový důl Český Krumlov, Czech Republic
• Pestera Cetatile Ponorului, Romania
• Izvor rijeke Cetine, Croatia
• Cenote Chac Mool, México
• Grotte de la Chaise, France
• Chal-Nakhjir, Iran
• Chalukyan Caves, India
• Chambers of the Black Hand, Australia
• Chamera Guffa, Nepal
• Le Musée du Champignon, France
• Chañarcillo Mine, Chile
• Channel Tunnel, Great Britain
• Chaoyang Dong, China
• El Chapandáz, Spain
• Gua Charah, Malaysia
• Charlottenhöhle, Germany
• The Chasm, New Zealand
• Underground Chattanooga, United States of America
• Chatterley Whitfield Mining Museum, Great Britain
• Grotte des Chauves-souris, Tunisia
• Grotte Chauvet 2 Ardèche, France
• Grotte Chauvet, France
• Che Chem Hah, Belize
• Cheddar Caves & Gorge, Great Britain
• Cheddar Gorge, Great Britain
• Chelmskie Podziemia Kredowe, Poland
• Cenote Chemuyil, México
• Cheongok-dong, South Korea
• Museum of Speleology and Bulgarian Karst, Bulgaria
• Historic Cherokee Caverns, United States of America
• Cherokee Cave, United States of America
• Chersonesos Cave Chruch, Russia
• Chessiloch, Switzerland
• Cheung Po Tsai Cave, China
• Tham Chiang Dao, Thailand
• Chicago Museum of Science and Industry, United States of America
• Minas Chico Rei, Brazil
• La Caverna de Chicoy, Guatemala
• Chi Day Caves, Vietnam
• Grotte du Chien, France
• Jenolan Caves - Chifley Cave, Australia
• Chikura Cavern, Japan
• Chilibrillo Cave, Panama
• Chillagoe Caves, Australia
• Chinhoyi Cave, Zimbabwe
• Chiquibul Cave System, Belize
• Chislehurst Caves, Great Britain
• Cholerenschlucht, Switzerland
• Cholerenschlucht, Switzerland
• Chollar Mine, United States of America
• Cholula - Quetzalcoatl Tunnels, México
• Tham Chom Ong, Laos
• Ch'ondong Cave, South Korea
• Grottes de Choranche, France
• Chrám kamene, Czech Republic
• Besucherbergwerk Grube Christiane, Germany
• Schieferbergwerk Grube Christine, Germany
• Chrustenická Šachta, Czech Republic
• Chua Tien, Vietnam
• Chudnite Mostove, Bulgaria
• Cueva de Chufín, Spain
• ChufutKale, Russia
• Chuiyun Tongtian River, China
• Chuquicamata Copper Mine, Chile
• Church Cave, Great Britain
• Paddock - Churchill's Secret Bunker, Great Britain
• Chýnovská jeskyně, Czech Republic
• Jaskinia Ciemna, Poland
• Cierny Vyvieracka, Slovakia
• Fort du Cindey, Switzerland
• Císařská jeskyně, Czech Republic
• Cisternerne, Denmark
• Cisterne Romane Amelia, Italy
• City Museum, United States of America
• Civil Defense Caves, United States of America
• Grotte de Clamouse, France
• Cueva Clara de Enpalme, Puerto Rico
• Grube Clara, Germany
• Clarksville Cave, United States of America
• Clearwater Cave, Malaysia
• Clearwell Caves, Great Britain
• St. Clements Caves, Great Britain
• Cliff Cave, United States of America
• Cliffs Shaft Mine Museum, United States of America
• Clifton Cliff Jail, United States of America
• Cloaca Maxima, Italy
• Grotte du Clos del Pous, France
• Le Clos des Roches, France
• C.M.T. Underground Mine Tour, Australia
• Jenolan Caves - Devil's Coach House, Australia
• Coaltown Museum, New Zealand
• Grotte de la Cocalière, France
• Grotta di Cocceio, Italy
• Grutas de Cocona, México
• Cody Caves Provincial Park, Canada
• La Miniera Di Cogne, Italy
• Schloß Colditz Escape Tunnels, Germany
• Coleman Rock Shop & Crystal Mines, United States of America
• Coles Cave, Barbados
• Les Coves del Collbato, Spain
• Grotta di Collepardo, Italy
• Cova d'es Coloms, Spain
• Gruta Colón, Uruguay
• Colonial Adit Underground Mine Tour, Canada
• Colorado Bend State Park, United States of America
• Gruta Colorida, Brazil
• Colossal Cave, United States of America
• Colossal Cave, United States of America
• Colosseum, Italy
• Colowyo Mine, United States of America
• Peştera Comarnic, Romania
• Grotte des Combarelles, France
• Combe Grède, Switzerland
• Grotte et Abime de Comblain-au-pont, Belgium
• Comet Gold Mine, Australia
• Compromise Mine, United States of America
• Las Conchas, Guatemala
• Conch Bar Caves, Turks and Caicos Islands
• Con Moong Cave, Vietnam
• Zeche Consolidation, Germany
• Consolidated Gold Mines, United States of America
• Museo della Civiltà Contadina, Italy
• Grotte Conturines, Italy
• Cooper's Cave, United States of America
• Copán, Honduras
• Coral Caverns, United States of America
• Antro del Corchia, Italy
• Corfu Cave Tour, Greece
• Grottes du Cornadore, France
• Corner Brook Cave, Canada
• Coronado Cave, United States of America
• Grotte de la Glacière de Corrençon, France
• Corris Mine Explorers, Great Britain
• Cosmic Caverns, United States of America
• Grotte Cosquer, France
• Mina Costanaza Logrosán, Spain
• Coteau Freedom Mine, United States of America
• Sima de las Cotorras, México
• Coudenberg Palace, Belgium
• Coudersport Ice Mine, United States of America
• Grottes de Cougnac, France
• Gabriel Coulet, France
• The Country Boy Mine, United States of America
• Musée de la Mine Couriot, France
• Dahlonega Courthouse Gold Museum State Historic Site, United States of America
• Santa Cueva de Covadonga, Spain
• Cueva de Covalanas, Spain
• Gorges de la Covatanne, Switzerland
• Cove Cave, Great Britain
• Coxcatlán Cave, México
• Grutas de Coyame, México
• Crag Cave, Ireland
• Crater of Diamonds State Park, United States of America
• Craters of the Moon, United States of America
• Maison des Pierreux de Crazannes, France
• Creede Underground Mining Museum, United States of America
• Cresson Mine, United States of America
• Festungsmuseum Crestawald, Switzerland
• Creswell Crags Gallery, Great Britain
• Creswell Crags, Great Britain
• Grotte du Crête de Vaas, Switzerland
• Creugenat, Switzerland
• Cricova Galeriile Subterane, Moldova
• Cripta Basiliana di San Michele, Italy
• Crisson Gold Mine, United States of America
• Grutas de Cristal, Spain
• Grotta dei Cristalli, Switzerland
• Mine Cristal, Canada
• Crocodile Harry, Australia
• Molinetto della Croda, Italy
• Abri de Cro-Magnon, France
• Crowborough Caves, Great Britain
• Crow Creek Mine, United States of America
• Crowley Lake Columns, United States of America
• Crown Cave, China
• Cruachan Power Station, Great Britain
• Subterranean Crusader City, Israel
• Crvena Stijena, Montenegro
• Crveno Jezero, Croatia
• Crystal Cave, United States of America
• Crystal Caves, Bermuda
• The Crystal Caves, Australia
• Crystal Ball Cave, United States of America
• Crystal Gold Mine, United States of America
• Crystal Grottoes Caverns, United States of America
• Crystal Lake Cave, United States of America
• Crystal Cave, United States of America
• Crystal Onyx Cave, United States of America
• Crystal Cave Park, United States of America
• Crystal Shrine Grotto, United States of America
• Crystal Caverns at Hupp's Hill, United States of America
• Crystal Cave, United States of America
• Cserszegtomaj barlang, Hungary
• Csodabogyós-barlang, Hungary
• Cuarenta Casas, México
• Cuarto-Cuarto Cave, Philippines
• Cuatro Puertas, Spain
• Cub Run Cave, United States of America
• Củ Chi Tunnels, Vietnam
• Grutas de Cuetzalan, México
• La Cuevona, Spain
• Cova es Cuilleram, Spain
• Çukurören Underground City, Turkey
• Cullinan Mine, South Africa
• Culver Hole, Great Britain
• Cuma - Antro della Sibilla, Italy
• Cumberland Caverns, United States of America
• Curraghmore House, Ireland
• Grotte Cussac, France
• St Cuthbert's Cave, Great Britain
• Cutta Cutta Caves, Australia
• Cuzamá Cenotes, México
• Cave of Cyclops, Greece
• Sztolnia "Czarny Potok" w Tarnowskich Gorach, Poland
• Daciyan, China
• Da Dung Mountain Caves, Vietnam
• Daegeumgul, South Korea
• Roung Dai Ho, Cambodia
• Les gorges du Daillet, Switzerland
• Fort de Dailly, Switzerland
• Daimasu shonyudo, Japan
• Dakhovskaya Cave, Russia
• Għar Dalam, Malta
• Heidenkapelle, France
• Dalton Gang Museum and Escape Tunnel, United States of America
• Damanhur Temple, Italy
• Cueva de Damas, Costa Rica
• Damawewe, Papua New Guinea
• Peştera Dambovicioara, Romania
• Dambulla, Sri Lanka
• Damlatas Magarasi, Turkey
• Dan-yr-Ogof - National Showcaves Centre for Wales, Great Britain
• Dandak Gufa, India
• Daneilshöhle, Germany
• Danger Cave, United States of America
• Dannemora Gruvor, Sweden
• Darband Cave, Iran
• Darby's Cave, Antigua & Barbuda
• Grotte de Dargilan, France
• Miniere di Darzo, Italy
• Dat Taw Gyaint Waterfall, Myanmar
• Dat Taw Taung Cave, Myanmar
• Daugbjerg Kalkgruber, Denmark
• Hang Dau Go, Vietnam
• Daveli's Cave, Greece
• David Gareja, Georgia
• David Hasselhoff Museum, Germany
• Historic Daydream Mine, Australia
• Dazu Grottoes, China
• D Dupleks, Latvia
• Dean's Blue Hole, Bahamas
• Central Deborah Gold Mine, Australia
• De Castellane, France
• Dechenhöhle, Germany
• Dedeli Konak, Turkey
• Deedote Blue Lagoon, Myanmar
• Gua Payau, Malaysia
• Deer Creek Narrows, United States of America
• Deinhard Kellermuseum, Germany
• Deir Muqallik, Israel
• Dekor 1 Gypsum Mine, Russia
• Delaware Copper Mine, United States of America
• De Leon Springs, United States of America
• Délirium Café, Belgium
• Delprats Underground Tourist Mine, Australia
• Demanovska L'adova Jaskyna, Slovakia
• Demanovska Jaskyna Slobody, Slovakia
• Demeter's Crypt, Russia
• Demir Baba, Bulgaria
• Grotte des Demoiselles, France
• Demoiselle, France
• Denisova, Russia
• Derinkuyu Underground City, Turkey
• Desert Cave Hotel, Australia
• DeSoto Caverns Park, United States of America
• Deutsches Bergbau Museum, Germany
• Deutsches Bunkermuseum, Germany
• Deutsches Museum, Germany
• Devataška peštera, Bulgaria
• Grotte de la Devèze, France
• Devil's Den, United States of America
• Devil's Den Cave, United States of America
• Devil's Hole, Bermuda
• Devil's Icebox Cave, United States of America
• Devil's Sinkhole, United States of America
• Devil's Well, United States of America
• Dewstow Gardens and Grottoes, Great Britain
• Dhank Caves, India
• Cueva del Diablo, Bolivia
• Caverna do Diabo, Brazil
• Cueva del Diabolo, Spain
• Diamond Caverns, United States of America
• Diamond Cave, Japan
• Hotel Diar el Barbar, Tunisia
• Dich Long Cave and Pagoda, Vietnam
• Didyma Caves, Greece
• Diebeshöhle, Germany
• Diebshöhle, Germany
• Diefenbunker, Canada
• Karsthöhle Dienstedt, Germany
• Burghöhle Dietfurt, Germany
• Digger's Dream Underground Home, Australia
• Dike Paku Gupha, Nepal
• Diktaion Antron, Greece
• Diktaeon Cave, Greece
• Dilek Magarasi, Turkey
• Dim Magarasi, Turkey
• Dimbulagala, Sri Lanka
• Dimnice Jama, Slovenia
• Dinosaur Caves Park, United States of America
• Dino's Monstergrot, Netherlands
• Caverna del Dio Mithra, Italy
• Gorges de la Diosaz, France
• Diósgyör-Tapolca barlang, Hungary
• Diu Diu Cave, Papua New Guinea
• Divaška Jama, Slovenia
• Divje Jezero, Slovenia
• Dixie Caverns, United States of America
• Đalovića Pecina, Montenegro
• Djara Cave, Egypt
• Djavolskoto Garlo Cave, Bulgaria
• Djurovica Jama, Croatia
• Dobakhol, India
• Dobsinska Ladova Jaskyna, Slovakia
• Dodurgalar Mağarası, Turkey
• Doktorshöhle, Germany
• Dolaucothi Gold Mine, Great Britain
• Dolinenweg Hengen, Germany
• Doling Cave, United States of America
• Dolní Vĕstonice, Czech Republic
• Dombashawa Rocks and Painted Cave Site, Zimbabwe
• Jaskyna Domica, Slovakia
• Grotte de Domme, France
• Muches de Domqueur, France
• Donauversickerung, Germany
• Cueva de Don Justo, Spain
• Donnersbachklamm, Austria
• Doolin Cave, Ireland
• Dorking Caves, Great Britain
• Dorohacchō Gorge, Japan
• Dorotheastolln, Germany
• Miniere di Dossena, Italy
• Grotta dei Dossi, Italy
• Source du Doubs, France
• Dougout Ranch, United States of America
• Tham Doun, Laos
• Down to Erth, Australia
• Cuevas del Drach, Spain
• Drachenhöhle, Austria
• Drachenloch, Switzerland
• Eisenacher Drachenschlucht, Germany
• Gruta del Drago, Panama
• Caverne du Dragon, France
• Dragon Cave, China
• Grotta della Dragonara, Italy
• Dragon Hall Undercroft, Great Britain
• Dragon Hole, China
• Drakelow Tunnels, Great Britain
• Drakospilia, Greece
• Drakonina Pecina, Croatia
• Grotte de la Draye Blanche, France
• Dreidärrischenhöhle, Austria
• Dreieingangshöhle, Germany
• Drei Kronen & Ehrt, Germany
• Wasserfall Dreimühlen, Germany
• Schwerspatmuseum Dreislar, Germany
• Muzey Drevnego Cheloveka, Russia
• Jaskyna Driny, Slovakia
• Drive-in Mine, Australia
• Spilaio Drogkarati, Greece
• Les Drois Glands, Luxembourg
• Druidenhain, Germany
• Dubocka Pecina, Serbia
• Ducktown Basin Museum, United States of America
• Dudley Canal Tunnels, Great Britain
• Historisches Kuperbergwerk Düppenweiler, Germany
• Duivelsgrot, Netherlands
• Duman, Bosnia and Herzegovina
• Dunaskin Open Air Museum, Great Britain
• Dunbar Cave, United States of America
• Duncan Escarpment, Canada
• DunHuang Mogao Caves, China
• Dunmore Caves, Ireland
• Dunsthöhle, Germany
• Dunston Cave, Trinidad and Tobago
• Dupnisa Mağarası, Turkey
• Dupont Underground, United States of America
• Paseo Túnel Minería Durango, México
• Dureb Caves, Namibia
• Durham Mining Museum, Great Britain
• Gorges du Durnand, Switzerland
• Peștera Duruitoarea, Moldova
• Dust Devil Mine, United States of America
• Dyavolski Most, Bulgaria
• Dyrhólaey, Iceland
• Dzibilchaltún Cenote, México
• Cenote Dzitnup, México
• Eagle Cave, United States of America
• Eagle and High Peak Mine, United States of America
• Tomb of the Eagles, Great Britain
• Eaik Sa Ta Ya Cave, Myanmar
• Earby Mining Museum, Great Britain
• Eastwater Cavern, Great Britain
• Ebbor Gorge, Great Britain
• Grotte d'Ebbou, France
• Eberstadter Tropfsteinhöhle, Germany
• Grottes des Echelles, France
• Echidna Chasm, Australia
• Echo Caves, South Africa
• Eckert James River Cave, United States of America
• Écomusée d'Alsace, France
• Ecton Mine Educational Centre, Great Britain
• Edakkal, India
• Mina de El Eden, México
• CSM Edgar Experimental Mine, United States of America
• Edna May Gold Mine, Australia
• Egkleistra, Cyprus
• Eglise monolithe Saint Jean, France
• Egloffsteiner Felsenkeller, Germany
• Musée des Égouts, Belgium
• Zinngrube Ehrenfriedersdorf, Germany
• Eichener See, Germany
• Ein Gedi, Israel
• Einhornhöhle, Germany
• Einhornhöhle, Austria
• Einödhöhle, Austria
• Eisenbreche Klamm, Germany
• Eisensteinstollen, Germany
• Eisensteinhöhle, Austria
• Eisinger Löcher, Germany
• Eiskapelle, Germany
• Eiskogelhöhle, Austria
• Eispalast Jungfraujoch, Switzerland
• Dachstein Eispalast, Austria
• Eispavillon Mittelallalin, Switzerland
• Eisriesenwelt, Austria
• Cueva de Ekain, Spain
• Ekotechnické Museum, Czech Republic
• El-Haouaria, Tunisia
• El Arcotete Parque Ecoturístico, México
• El Capitan Cave, United States of America
• El Capulín Natural Pool, El Salvador
• Cuevas de El Castillo y Las Monedas, Spain
• El Cerrejón Coal Mine, Colombia
• Cueva El Chorreadero, México
• Coves del Cogul, Spain
• Eldorado Canyon Mine Tours, United States of America
• Electric Mountain Visitor Centre, Great Britain
• Elephanta Caves, India
• Elfengrotte, Germany
• Elkep Evi Cave Houses, Turkey
• Jaunpils Elles Kalns, Latvia
• Spilea Ellinokamára - Ellinokamára Cave, Greece
• Ellinwood Underground Tunnels, United States of America
• Elliot Lake Nuclear and Mining Museum, Canada
• Elliott Underground Quarry, United States of America
• Ellora Caves, India
• El Majé Caves, Panama
• El Malpais National Monument, United States of America
• El Meson de la Cava, Dominican Republic
• Cueva de El Pendo, Spain
• El Puente Natural, Panama
• Cavernas El Sauce, Argentina
• El Tajo Canyon, Spain
• Coves del Toll, Spain
• El Torcal de Antequera, Spain
• El Zanjón de Granados, Argentina
• Emerald Village, United States of America
• Pestera Emil Racovita, Moldova
• Muzeul de Speologie "Emil Racoviţă", Romania
• Emine Bair Khasar Cave, Russia
• Emmaville Mining Museum, Australia
• Empire Mine State Historic Park, United States of America
• Empire Cave, United States of America
• Gruta das Encantadas, Brazil
• Poço Encantado, Brazil
• Enchanted Cave, Philippines
• Endless Caverns, United States of America
• Cueva de Los Enebralejos, Spain
• Engenlochschlucht, Austria
• Schieferbergwerk im Engi, Switzerland
• Englebrecht Cave, Australia
• Enoshima Iwaya Cave, Japan
• Enterprise Pit Mine Lookout, Australia
• Entrische Kirche, Austria
• Furna do Enxofre, Portugal
• Le Blockhaus d'Éperlecques, France
• Eshab-i Kehf - Grotto of Seven Sleepers, Turkey
• Musée de la mine Epinac, France
• Grotte d'Eprave, Belgium
• Grotte di Equi Terme, Italy
• Steinerne Rinne bei Erasbach, Germany
• Tham Erawan, Thailand
• Erawan Falls, Thailand
• Bergbau- und Heimatmuseum Erbendorf, Germany
• Erbendorfer Felsenkeller, Germany
• Alte Hoffnung Erbstolln, Germany
• Karstlehrpfad Breitscheid-Erdbach, Germany
• Erdmannshöhle, Germany
• Erma Gorge, Bulgaria
• Museo Minero de Riotinto "Ernest Lluch", Spain
• Stollen Erwein II, Germany
• Erzberg, Austria
• Tropfsteinhöhle Erzenhausen, Germany
• Esbelli Evi, Turkey
• Casemate Esch, France
• Minera Escondida, Chile
• Cenote Escondido, México
• Gruta do Escoural, Portugal
• Eski-Kermen, Russia
• Gouffre d'Esparros, France
• Esperhöhle, Germany
• Gruta del Espiritu Santo, El Salvador
• Essex Secret Bunker, Great Britain
• Esterlin, France
• Grutas de la Estrella, México
• Cascade d’Étufs, France
• Tunnel of Eupalinus, Greece
• Eureka Tunnel, United States of America
• Eureka Springs Underground, United States of America
• Euston Lost Tunnels, Great Britain
• Evakueringshulen, Norway
• Sentier karstique à Excideuil, France
• Exeter's Underground Passages, Great Britain
• Centro de Interpretación de la minería en Extremadura, Spain
• Gruta da Fada, Brazil
• Gouffre de la Fage, France
• Museo Faggiano, Italy
• Fairy Cave, Malaysia
• Buchan Caves - Fairy Cave, Australia
• Fairy Dell Cave, Australia
• Fakıllı Mağarası, Turkey
• Bunker Falkenhagen, Germany
• Falkensteiner Höhle, Germany
• Falkirk Mine, United States of America
• Falling Waters Sink, United States of America
• Knappenloch Fallwindes, Austria
• Cueva del Fantasma, Venezuela
• Fantastic Caverns, United States of America
• Fantasy Cave, Bermuda
• Fantasy World Caverns, United States of America
• Faqra Natural Bridge, Lebanon
• I Faraglioni, Italy
• Faris Caves, United States of America
• Le Faux Saulnier, France
• Fayes Underground Home, Australia
• Buchan Caves - Federal Cave, Australia
• Federal Reserve Bank of New York Gold Vault, United States of America
• Feengrotten, Germany
• Grotte aux Fées, Switzerland
• Grube Feggendorfer Stolln, Germany
• Felicitas Heilstollen, Germany
• Besucherbergwerk Fell, Germany
• Fels Cave, Vanuatu
• Österreichisches Felsbildermuseum, Austria
• Felsendome Rabenstein, Germany
• Nürnberger Felsengänge, Germany
• Felsenkirche Idar-Oberstein, Germany
• Hemer Felsenmeer, Germany
• Gruta do Fendão, Brazil
• Fengyu Cave, China
• Cisterne Romane Fermo, Italy
• Fern Grotto, United States of America
• Fern and Roman Caves, Great Britain
• La Ferrassie, France
• Ferreira's Mine, South Africa
• Fertőrákosi Barlangszínház, Hungary
• Poço Fervedouro, Brazil
• Špilja Feštinsko Kraljevstvo, Croatia
• Lycian Tombs at Fethiye, Turkey
• Feuchter Keller, Austria
• Grotta del Fico, Italy
• Gorges du Fier, France
• Wombeyan Caves - Fig Tree Cave, Australia
• Filipinas Larimar Mine, Dominican Republic
• St Fillan's Cave, Great Britain
• Domaine Filliatreau, France
• Finca Ixobel River Cave Trip, Guatemala
• Fingal's Cave, Great Britain
• Finnforsrövarnas grotta, Sweden
• Finnich Glen, Great Britain
• Finsteres Loch, Germany
• Besuchsbergwerk Finstergrund, Germany
• Schaubergwerk "Finstertal" Asbach, Germany
• Grotta Fioravante, Italy
• Fire Clay Caverns, Australia
• Fischbach, Germany
• Fisher Cave, United States of America
• Fisher's Cave, United States of America
• Fish River Canyon, Namibia
• Sorgente Fiumelatte, Italy
• Five-Flower Lake, China
• Flaat Nikkelgruve, Norway
• Flagstaff Lava River Cave, United States of America
• Flascharův důl, Czech Republic
• Flogbergets gruva, Sweden
• Grotte de Floreffe, Belgium
• Florence Mine Heritage Centre, Great Britain
• Florida Caverns State Park, United States of America
• Florida Museum of Natural History, United States of America
• Flour Cave, Israel
• Flume Gorge, United States of America
• Fluweelengrot, Netherlands
• Gruta do Fogo, Brazil
• Fohlenhaus, Germany
• Bergbaumuseum Fohnsdorf, Austria
• Grotte de Foissac, France
• Folldal Gamle Gruver, Norway
• Grottes de Folx-Les-Caves, Belgium
• Parc Industriel et Ferroviaire du Fond-de-Gras, Luxembourg
• Le Fondry Des Chiens, Belgium
• José Maria da Fonseca Wine Cellars, Portugal
• Grotte de Font-de-Gaume, France
• Cimitero delle Fontanelle, Italy
• Fontein Grot, Aruba
• Minas Fonte Meu Bem Querer, Brazil
• Fontaine de Fontestorbes, France
• Abbaye Royale de Fontevraud, France
• Grottes de Fontirou, France
• Cova de la Font Major, Spain
• Grotte de Fontrabiouse, France
• Cova Forada, Spain
• Forbidden Caverns, United States of America
• Forchheimer Keller, Germany
• Forestiere Underground Gardens, United States of America
• L'Aven Grotte de la Forestière, France
• La Fornace di Barbablù, Italy
• Fort Bonifacio Tunnel, Philippines
• Fort Rock Cave, United States of America
• Fort Stanton Cave, United States of America
• Grube Fortuna, Germany
• La Fosse de Forges, France
• Gorges de la Fou, France
• Grotte du Foulon, France
• Fountain Cave, United States of America
• Fountain Cavern, Anguilla
• Les mines d'argent du Fournel, France
• Fox River Caves, New Zealand
• Höhlenburg Fracstein, Switzerland
• Spilaion Frahthi - Frahthi Cave - Franchthi Cave, Greece
• Cueva de los Franceses, Spain
• Francetova Jama, Slovenia
• Franciscan Monastery, United States of America
• Francisco Dagohoy Cave, Philippines
• Tomba Francois, Italy
• Frank Aston Underground Museum, Australia
• Franklin Mineral Museum & Mine Replica, United States of America
• Franklin Court Underground Museum, United States of America
• Frantoi Ipogei di Grottaglie, Italy
• Frantoio Ipogeo Granafei, Italy
• Frantoio Ipogeo Caffa, Italy
• Grotta Grande del Vento - Grotte di Frasassi, Italy
• Tempio del Valadier - Santa Maria di Frasassi - Infrasaxa - Grotte di Frasassi, Italy
• Höhlenmuseum Frasdorf, Germany
• Frauenmauerhöhle, Austria
• Free Enterprise Health Mine, United States of America
• Furna de Frei Matias, Portugal
• Schaubergwerk St. Anna am Freudenstein, Germany
• Heilklimastollen Friedrich, Austria
• Friedrich-Wilhelm-Stollen, Germany
• Gouffre Friouato, Morocco
• Eisenerzbergwerk Frischglück, Germany
• Fröå gruva, Sweden
• Fudo-kutsu, Japan
• Cuevas de Fuentemolinos, Spain
• Cuevas de Fuentes de Leon, Spain
• Festung Fürigen, Switzerland
• Fürstenzeche, Germany
• Grüner Bräu Keller, Germany
• Fugaku Fuketsu, Japan
• Fugoppe-dokutsu, Japan
• Führerbunker, Germany
• Fuji-do, Japan
• Fukiya Copper Mine, Japan
• Fulford Cave, United States of America
• Funakubo Shonyudo, Japan
• Funatsu Tainai, Japan
• Furaku Cave, Japan
• Furen shonyudo, Japan
• Parc National de Furfooz, Belgium
• Gruta da Furninha, Portugal
• Furong Dong, China
• Futenma Gongen, Japan
• Fuyang Cave, China
• Silberstollen Gabe Gottes, Germany
• Gadara, Jordan
• Goa Gajah, Indonesia
• Galazia Spiliá - Blue Grotto, Greece
• Galázia Spiliá, Greece
• Galázia Spiliá - Blue Grotto - Korithi Cave, Greece
• Cueva de la Galiana, Spain
• Gamaoreum Japanese Cavern Site, South Korea
• Miniera Gambatesa, Italy
• Gamirasu Otel, Turkey
• Sinks of Gandy, United States of America
• Gavi Gangadhareswara, India
• Knappenloch Ganotz, Austria
• Gap Cave, United States of America
• Gaping Ghyll, Great Britain
• Grutas de Garcia, México
• Gardner Cave, United States of America
• Sea Caves of the Gargano, Italy
• Grottes Prehistorique de Gargas, France
• Atombunker Garzau, Germany
• Gasparee Caves, Trinidad and Tobago
• Gassel-Tropfsteinhöhle, Austria
• Gasteiner Heilstollen, Austria
• Gatklettur, Iceland
• Cueva del Gato, Spain
• Gaub Cave, Namibia
• Store Gaulstadgrotta, Norway
• Mines Prehistòriques de Gavà, Spain
• Parco Minerario Naturalistico di Gavorrano, Italy
• Gaxian Dong, China
• Gaziemir Yer Altı Şehri, Turkey
• Mestská a naftárska expozícia Gbely, Slovakia
• Gcwihaba Caverns, Botswana
• Geevor Tin Mine, Great Britain
• Geghard, Armenia
• Geikie Gorge, Australia
• Geissenklösterle, Germany
• Cave Church at Gellért Hill, Hungary
• Banícke Múzeum Gelnica, Slovakia
• Grotta del Gelo, Italy
• Gemeentegrot, Netherlands
• Gems Museum, Myanmar
• Les Caves de la Genevraie, France
• Cueva de Genova, Spain
• Grotta del Genovese, Italy
• Genovevahöhle, Germany
• Genovevahöhle, Germany
• Museo dei Minerali della Gente di Rio, Italy
• Genzan-kutsu, Japan
• Geophysical Cave, Russia
• Förderturm der Grube Georg, Germany
• George's Gold Mine, Australia
• Geraer Höhler, Germany
• Spilaion Gerani, Greece
• German Underground Hospital, Great Britain
• German Military Underground Hospital, Great Britain
• German Naval Signals Headquarters, Great Britain
• La Grotta Dei Germogli, Italy
• Carriere souterraine de Gèromont, Belgium
• Kristallkluft Gerstenegg, Switzerland
• Grotto of Gethsemane, Israel
• Ghardaia, Algeria
• Peştera Ghetarul Focul Viu, Romania
• Giant's Cave, Great Britain
• Giants Cave, Australia
• Grotta Gigante, Italy
• Gila Cliff Dwellings, United States of America
• Giligili Cave, Papua New Guinea
• Gilmerton Cove, Great Britain
• Gimpel-Labyrinth, Austria
• Ginryu-do, Japan
• Der Karstwanderweg am Südharz, Germany
• Grotta Giusti Terme, Italy
• Gjabakkahellir, Iceland
• Grotte de la Glacière, France
• Cave of Padre Glandorff, México
• Grube Glasebach, Germany
• Travertine Terrasses in the Glatt Valley, Germany
• Jaskinia Głęboka, Poland
• Besucherbergwerk Gleißinger-Fels, Germany
• The turlough in Glenamaddy, Ireland
• Glengowla Mines, Ireland
• Glen Osmond Mine Tour, Australia
• Glenwood Caverns, United States of America
• Gletscherschlucht, Switzerland
• Glifada, Greece
• Schaubergwerk Frisch Glück Glöckl, Germany
• Gruta da Glória, Brazil
• Glory Hole Waterfall, United States of America
• Waitomo Glowworm Grotto, New Zealand
• Tajemnicze Podziemne Miasto Gluszyca, Poland
• Go Below Underground Adventures, Great Britain
• Göpfelsteinhöhle, Germany
• Mine d'antimoine à Goesdorf, Luxembourg
• Besucherbergwerk Im Gößner, Germany
• Goetz-Höhle, Germany
• Gökgöl Magarasi, Turkey
• Gokuraku-do, Japan
• Goldbergbaumuseum Goldkronach, Germany
• GoldBottom Mine Tours, Canada
• Gold Bug Mine, United States of America
• Golden Cathedral, United States of America
• Goldfield Mine, United States of America
• Museum of the Goldfields, Australia
• Besucherbergwerk Goldhausen, Germany
• Gold King Mine, United States of America
• Gold Reef City, South Africa
• Gold Road Mine Tours, United States of America
• Große und Kleine Golke, Germany
• Sótano de las Golondrinas, México
• Jama Golubinka, Croatia
• Golubinsky Proval, Russia
• Golubnjaca Pecina, Croatia
• Blue Lake, Russia
• Gomantong Caves, Malaysia
• Gombasecka Jaskyna, Slovakia
• Eisenbergwerk Gonzen AG, Switzerland
• Good Enough Mine, United States of America
• Good Luck Cave, Malaysia
• Goodluck Mine, Great Britain
• Great Ocean Road, Australia
• Ecomuseo Miniere di Gorno, Italy
• Gossidong Gul, South Korea
• Gosudong Gul, South Korea
• Gottesackerplateau, Germany
• Gotthard Basistunnel, Switzerland
• Gorges de Gouleyrous, France
• Vallée troglodytique des Goupillières, France
• Gouvernéto Cave - Bears' Cave, Greece
• Goya shonyudo, Japan
• Grotte de Goyet, Belgium
• Goyomatsu shonyudo, Japan
• Gruvmuseet Grängesberg, Sweden
• Graham Cave, United States of America
• Granatium, Austria
• Gran Cenote, México
• Grand Caverns, United States of America
• Jenolan Caves - Grand Arch, Australia
• Grand Canyon Caverns, United States of America
• Grand Canyon, United States of America
• Les Grandes Canalettes, France
• Grand Gulf State Park, United States of America
• Grotte du Grand Roc, France
• Caverna La Gran Galería, Costa Rica
• Grapčeva Špilja, Croatia
• Graselhöhle, Austria
• Parco Naturale del Rio Grassano, Italy
• Grasslhöhle, Austria
• Bergbaumuseum Graubünden, Switzerland
• Maisons troglodytes du Graufthal, France
• Great Cave, Cayman Islands
• Great Masson Cavern, Great Britain
• Great Onyx Cave, United States of America
• Great Orme Bronze Age Copper Mines, Great Britain
• Great Rutland Cavern, Great Britain
• Underground Great Wall, China
• Greenbrier Bunker, United States of America
• Green Grotto Caves, Jamaica
• Green's Cave, United States of America
• Greenwich Foot Tunnel, Great Britain
• Greig's Scenic Caves, Canada
• Caves Louis de Grenelle, France
• Grgosova Špilja, Croatia
• Griffener Tropfsteinhöhle, Austria
• Schaubergwerk am Grillenberg, Austria
• Grimes Graves, Great Britain
• Felslabor Grimsel, Switzerland
• Kraftwerk Grimsel 2, Switzerland
• Grjótagjá, Iceland
• Gronligrotta, Norway
• Große Grotte, Germany
• Großer Lochstein, Germany
• Große Scheuer, Germany
• Grotesquery, Czech Republic
• Grottenaquarium, Netherlands
• Höhlenburg Grottenstein, Switzerland
• The Grotto, Australia
• The Grotto, Northern Mariana Islands
• The Grove Park Inn, United States of America
• Gruebisbalm Höhle, Switzerland
• Gründelsloch, Germany
• Erlebniswelt am Grünten, Germany
• Gruve 3, Norway
• Gruve 7, Norway
• Gruvkapellet, Sweden
• Grza, Serbia
• Guacara Taina, Dominican Republic
• Cueva del Guácharo, Venezuela
• Cueva de los Guácharos, Colombia
• Cueva de los Guacharos, Perú
• Guadirikiri Grot, Aruba
• Guadix Cave Houses, Spain
• Cueva de Guahedum, Spain
• Guajataca Forest, Puerto Rico
• Cueva de Gualicho, Argentina
• Guanma Dong, China
• Barranco de Guayadeque, Spain
• Bergbaumuseum und Besucherbergwerk Grube Günnersdorf, Germany
• Musée des Gueules Rouges, France
• Guhantara, India
• Miniera d'Oro della Guia, Italy
• Skansen Podziemny "Guido" w Zabrzu, Poland
• Guildhall Medieval Crypt, Great Britain
• Guimit Cave, Philippines
• Gujohachiman dai-shonyudo, Japan
• Guler Ice Caves, United States of America
• Gunnadoo Gold Mine, Australia
• Gunns Plains Caves, Australia
• Gunung Senyum Caves, Malaysia
• Hilfskrankenhaus Gunzenhausen, Germany
• Gupteswor Mahadev Gufa, Nepal
• Gupteswar Gupha, India
• Gurugem Phuk, China
• Gußmannhöhle, Germany
• Grube Gustav, Germany
• Gutenberger Höhle, Germany
• Gutmana Ala, Latvia
• Guyaju Caves, China
• Gwalia Gold Mine, Australia
• Gwangmyeongdonggul, South Korea
• Gýgagjá, Iceland
• Gympie Gold Mining and Historical Museum, Australia
• Gyokusen-do, Japan
• Haan Gul, South Korea
• Habis Caves, Lebanon
• Hachijo fuketsu, Japan
• Hack Green Secret Nuclear Bunker, Great Britain
• Hadeland Bergverksmuseum, Norway
• Hadži-Prodanova Pecina, Serbia
• Ha Ha Tonka State Park, United States of America
• Haig Colliery Mining Museum, Great Britain
• Haikong Cave, China
• Hainault Gold Mine, Australia
• Haizhou Mine, China
• Hakuba-do, Japan
• Hakuun-do, Japan
• Mithrasgrotte, Germany
• Bergbaumuseum Hall, Austria
• Halliggye Fogou, Great Britain
• Hallstatt, Austria
• Hal Saflieni Hypogeum, Malta
• Hálsanefshellir Cave, Iceland
• Hamatoura Monastery, Lebanon
• Hamilton Pool, United States of America
• Hamilton's Caves, Bahamas
• Grotte Hamma, Algeria
• Cuevas de Hams, Spain
• Grottes de Han-sur-Lesse, Belgium
• Hana Lava Tube, United States of America
• Expozícia uhoľného baníctva na Slovenku, Slovakia
• Hang Ma, Vietnam
• Hang Son Doong, Vietnam
• Hanibe Caves, Japan
• Hannan's North Tourist Mine - The Mining Hall Of Fame, Australia
• Hantongshan Shenxian Dong, China
• Haramiiska Dupka, Bulgaria
• Musée de la Mine d'Harchies, Belgium
• Grua va Hardömbl, Italy
• Hard Rock Vault, Great Britain
• Hard Tack Mine, United States of America
• Hard Times Mine, Australia
• Haritun Cave, Israel
• Spilia Harkadio - Harkadio Cave, Greece
• Harmanecká Jaskyna, Slovakia
• Bunker Harnekop, Germany
• Harrie Wood Cave, Australia
• Harrison's Cave, Barbados
• Hartford Cave, Bahamas
• Harman 1, Australia
• Hartness House, United States of America
• Harwood's Hole, New Zealand
• Għar Hasan, Malta
• Hashidate shonyudo, Japan
• Hashima Mine, Japan
• Hastings Caves, Australia
• Hatchet Bay Cave, Bahamas
• Musée de l'Abri de Hatten, France
• Haunted Cave, United States of America
• Hausertorstollen, Germany
• Les Hautes Roches, France
• Ardoisière Haut-Martelange, Luxembourg
• Havasu Falls, United States of America
• Hawkstone Park, Great Britain
• Monastery of Our Lady of Hawqa, Lebanon
• Hazan Caves, Israel
• Besucherbergwerk "Heilige Drei Könige", Germany
• Goldgräberdorf Heiligenblut, Austria
• Heimensteinhöhle, Germany
• Heimkehle, Germany
• Heineman Winery - Crystal Cave, United States of America
• Heinrichshöhle, Germany
• Heinrich-Kocher-Stollen, Germany
• Hei Shan Gou, China
• Festung Heldsberg, Switzerland
• Restaurant l'Hélianthe, France
• Caves of Hella, Iceland
• Hella-Glück-Stollen, Germany
• Hellfire Corner, Great Britain
• Hellnahellir, Iceland
• Helme Koopad, Estonia
• Henneth Annûn, Middle-Earth
• Galleria Henry, Italy
• Henry Morgan's Cave, Bahamas
• Herbstlabyrinth-Adventhöhle-System, Germany
• Grottes d'Hercules, Morocco
• Heritage Gold Mine Park, United States of America
• Hermannshöhle, Germany
• Hermannshöhle, Austria
• Höhle auf dem Großen Hermannstein, Germany
• Hermit's Cave, Australia
• Grutas los Herrara, México
• Schiefergrube Herrenberg, Germany
• Herts Young Mariners Base, Great Britain
• Hezekiah's Tunnel, Israel
• Hibbing Taconite Tours, United States of America
• Hickelhöhle, Germany
• Hida dai-shonyudo, Japan
• Hidden Cave, United States of America
• Hidden Forest Cave, United States of America
• Hidden River Cave, United States of America
• Hidden Worlds Cenotes, México
• Hidee Gold Mine, United States of America
• Hierve el Agua, México
• Hilehvar Buried Village, Iran
• Hill Annex Mine, United States of America
• Himalaya Tourmaline Mine, United States of America
• Himmelfahrt Fundgrube, Germany
• Himmelsbergstollen, Germany
• Himmlisch Heer, Germany
• Hinagdanan Cave, Philippines
• Hipasam Iron Mine, Argentina
• Hirano-do, Japan
• Hito-ana, Japan
• Hitonhauta, Finland
• Vyvieračka Hlbokô, Slovakia
• Důl Hlubina, Czech Republic
• Banský Skanzen v Hnilčíku, Slovakia
• Hobbiton, New Zealand
• Schaubergwerk Hochfeld, Austria
• Hochkarschacht, Austria
• Hocking Hills State Park, United States of America
• Hodruša Hámre, Slovakia
• Höllentalklamm, Germany
• Hölloch, Switzerland
• Höhlenkundliches Museum, Germany
• Schaubergwerk Hofergraben, Austria
• Hoffnungsstollen Todtmoos, Germany
• Högberget Cave, Finland
• Hohenfels-Essinger Eishöhlen, Germany
• Magnesitstollen Hohentauern, Austria
• Hohlenstein, Germany
• Hohlensteinhöhle, Austria
• Hohler Fels, Germany
• Hohler Stein bei Schambach, Germany
• Tham Hoi, Laos
• Hole N" The Rock, United States of America
• Hole in the Rock, New Zealand
• Holkovsky Monastery, Russia
• Hollenkammer, Germany
• Schloßberghöhlen, Germany
• Homestake Mine, United States of America
• Homestead Crater, United States of America
• Honey Branch Cave, United States of America
• Honeycomb Cave, New Zealand
• Honeycomb Cave, Australia
• Honister Slate Mine, Great Britain
• Hopemore Mine, United States of America
• Hopewell Colliery, Great Britain
• Hoq Cave, Yemen
• Horne Lake Caves, Canada
• Hornkullens gruvor, Sweden
• Cueva de Hornos de la Peña, Spain
• Grand Hornu, Belgium
• Horseshoe Bend, United States of America
• Hoshino-no ana, Japan
• Hospital Cave, Vietnam
• Hotel Jalta Bunker Museum, Czech Republic
• Hotel Sassi Di Matera Diffuso, Italy
• Grottes des 1001 Nuits, Belgium
• Hou'er Sinkhole, China
• House on Fire, United States of America
• House of Rock, Samoa
• Downtown Houston Tunnel System, United States of America
• Hoverbergsgrottan, Sweden
• Howe Caverns, United States of America
• How Stean Gorge, Great Britain
• Hranická propast, Czech Republic
• Htan San Cave, Myanmar
• Gruta de Huagapo, Perú
• Huanglong Dong, China
• Huanglong, China
• Huánglóng dòng, China
• Huangzhu Dong, China
• Huashan Quarries, China
• Huayan Temple, China
• Hubbard's Cave, United States of America
• Hubertuskapelle, Germany
• Peştera Huda lui Papară, Romania
• Huda Luknja, Slovenia
• Besucherbergwerk Grube "Hühn", Germany
• Hülbener Tropfsteinhöhle, Germany
• Huelgoat, France
• Cueva Huerta, Spain
• Schaubergwerk Hüttenberg, Austria
• Hufangalupe, Tonga
• Hugh's Dale Waterfall, Australia
• Grotte des Huguenots, France
• Huliba Grot, Aruba
• Huligemmana Kolla, India
• Hull Rust Mine, United States of America
• 'Ana Hulu, Tonga
• Humphrey Kynaston's Cave, Great Britain
• Hundalm Eis- und Tropfsteinhöhle, Austria
• Hundraðmannahellir, Iceland
• Hungerbrunnen, Germany
• Dong Huong Tich, Vietnam
• Hurricane River Cave, United States of America
• Mines de Hussigny-Godbrange, France
• Husitské muzeum, Czech Republic
• Huto and Kamarband Cave, Iran
• Hwaam Gul, South Korea
• Hwanggeum Dong, China
• Hwanseon Gul, South Korea
• Hyeopjae Gul - Ssangyong Gul, South Korea
• Iagodinska Peštera, Bulgaria
• Peştera Ialomita, Romania
• Bergbaumuseum Ibbenbüren, Germany
• Iberger Tropfsteinhöhle, Germany
• Ice Cave, United States of America
• Ice Age Glacial Exhibit, United States of America
• Ice Caves Mountain, United States of America
• Ichetucknee Spring, United States of America
• Għar Id-Duhhan, Malta
• Idagrotte, Germany
• Idaho's Mammoth Cave, United States of America
• Idaion Antron, Greece
• Ignateva Pestera, Russia
• Iho-Eleru, Nigeria
• Cenote Ik Kil, México
• Ikuno Silver Mine, Japan
• Ikura-do, Japan
• Għar il-Kbir, Malta
• Spilia Illithias - Cave of Ilithias, Greece
• La Grotte (Illetas Club Playa), Spain
• Illinois Caverns, United States of America
• Il-Maqluba, Malta
• Ilsenhöhle, Germany
• Jenolan Caves - Imperial Cave, Australia
• Bergbauerlebniswelt Imsbach, Germany
• Inanke Cave, Zimbabwe
• Inazumi suichu shonyudo, Japan
• Puente del Inca, Argentina
• Inca Cueva, Argentina
• Incirli Cave, Cyprus
• Museum of Independence, Bangladesh
• Indian Caverns, United States of America
• Indian Cave, Antigua & Barbuda
• Indiana Caverns, United States of America
• Indianapolis City Market Catacombs, United States of America
• Indian Echo Caverns, United States of America
• Indian Cave State Park, United States of America
• Indian Trail Caverns, United States of America
• Indian Cave Village, United States of America
• Cuevas del Indio, Cuba
• Cueva del Indio, Puerto Rico
• Boca do Inferno, Portugal
• Grotta dell'Onferno, Italy
• Cueva del Infierno, Puerto Rico
• 3rd Infiltration Tunnel, South Korea
• Ingleborough Cave, Great Britain
• Injun Joe's Cave, United States of America
• Inkerman Cave Monastery, Russia
• Qaura - Inland Sea, Malta
• Inner Space Cavern, United States of America
• Inscrições Rupestres, Brazil
• Institutul de Speologie "Emil Racoviţă", Romania
• Insuyu Mağarasın, Turkey
• Intermittent Spring, United States of America
• Interstate Caves, United States of America
• Limni Ioanninon - Lake Pamvotis, Greece
• Ipswich Caves, Jamaica
• Irimizu shonyudo, Japan
• Ironbridge Gorge Museum, Great Britain
• Iron Mountain Iron Mine, United States of America
• Ishigaki Do, Japan
• Grotte Is Janas, Italy
• Cava d'Ispica, Italy
• Voragine di Ispinigoli, Italy
• Les Grottes Isturitz et Oxocelhaya, France
• Grotte Is Zuddas, Italy
• Ivanovo Rock Churches, Bulgaria
• Iwami Ginzan, Japan
• Izuru shonyudo, Japan
• Jacks Blowhole, New Zealand
• Jacob's Well, United States of America
• Jacob's Cave, United States of America
• Jagersfontein Mine, South Africa
• Jameos del Agua, Spain
• James Bond Rock, Thailand
• Štola Jana Evangelisty, Czech Republic
• Caverna Janelão, Brazil
• Jánošíkove diery, Slovakia
• Jarnan Cave, Oman
• Podziemna Trasa w Jarosławiu, Poland
• Jasovska Jaskyna, Slovakia
• Jasujeong, South Korea
• Javoříčské jeskyně, Czech Republic
• Mina de la Jayona, Spain
• Magharet Jeita, Lebanon
• Jeongbang Waterfall, South Korea
• Grottes du Pic du Jer, France
• Jersey Cave, Australia
• Gruta dos Jesuítas, Brazil
• La Cueva del tío Jesús, Spain
• Jewel Cave, United States of America
• Margaret River Caves - Jewel Cave, Australia
• Jiguandong, China
• Jihlavské podzemí, Czech Republic
• Jillabenan Cave, Australia
• Jing Dong Da Rong Dong, China
• Jiulongdong, China
• Jiutian Dong, China
• Jiutian Dong, China
• Jiuxiang Scenic Resort, China
• Jiuxiao Biyundong, China
• Jobitzinaj Cave, Guatemala
• Štola Johannes, Czech Republic
• Johannesbachklamm, Austria
• Johannisfelsen, Germany
• Poarta Lui Johele, Romania
• Goa Jomblang, Indonesia
• Jomon shonyudo, Japan
• Grottes de Jonas, France
• Jordan Creek Underground Tours, United States of America
• Josefov Podzemi, Czech Republic
• Musée de la Mine à Joseph-Else, France
• Les Journées de la Rose, France
• Jenolan Caves - Jubilee Cave, Australia
• Internationales Fledermaus-Museum Julianenhof, Germany
• Cavernas de Jumandi, Ecuador
• Junagadh Caves, India
• Wombeyan Caves - Junction Cave, Australia
• Jungfernhöhle, Germany
• Junkundar Coal Mine, India
• Jurnet's Bar, Great Britain
• Grutas de Juxtlahuaca, México
• Kaaiman's Grotto, South Africa
• Kaaterskill Falls, United States of America
• Termálny Prameň Kaďa, Slovakia
• Magharet Qadisha, Lebanon
• Cave Church Kadjenica, Serbia
• Bergbaumuseum und Besucherbergwerk Käpfnach, Switzerland
• Eesti Kaevandusmuusem, Estonia
• Tham Kaew Komol, Thailand
• Kåfjord Kopperverk, Norway
• Kagekiyo-do, Japan
• Kahlensteinhöhle, Germany
• Kailash Gufa, India
• Kain Hitam - The Painted Cave, Malaysia
• Ana Kai Tangata, Chile
• Kajlaška peštera, Bulgaria
• Ana Kakenga, Chile
• Kaklik Mağarası, Turkey
• Gorges de Kakuetta, France
• Kakushöhle, Germany
• Kalabera Cave, Northern Mariana Islands
• Kalkstensgrottor, Sweden
• Ausweichsitz Nordrhein-Westfalen, Germany
• Hohler Stein, Germany
• Emmi Cheese Cave Kaltbach, Switzerland
• Kamarai Gorge, Greece
• Spilaio Kamares - Cave Kamaron - Kamares Cave, Greece
• Kamieńczyk Gorge, Poland
• Kammerbacher Höhle, Germany
• Haus des Bergmanns, Germany
• Besucherbergwerk Kamsdorf, Germany
• Cizinecký vstup do kanalizace, Czech Republic
• Kana Raja's Cave, Bangladesh
• Kanarra Creek Gorge, United States of America
• Kanba-no Oni-no ana, Japan
• Las Cuevas de K'an Ba, Guatemala
• Kandovan, Iran
• Kanheri Caves, India
• Grotten Van Kanne, Belgium
• Kanowna Belle Goldmines, Australia
• Kansas Underground Salt Museum, United States of America
• Mogharet el Kantara, Libya
• Kantun Chi Caves, México
• Kanze Limestone Cave, Japan
• Tham Kao Rao, Laos
• Bunker am Kap Arkona, Germany
• Kap-Kutan Cave, Turkmenistan
• Kapova Cave, Russia
• Kåppasjåkkagrottorna, Sweden
• Kapsia Cave, Greece
• Kapucínská krypta, Czech Republic
• Karaca Mağarası, Turkey
• Karaftu Cave, Iran
• Karain Mağarası, Turkey
• Karla Caves, India
• Karl-May-Höhle, Germany
• Karlyuk Caves, Turkmenistan
• Grutas Karmidas, México
• Karstkundlicher Wanderweg Laichingen, Germany
• Kartchner Caverns State Park, United States of America
• Brasserie Kazematten, Belgium
• Spilaio Kastritza - Kastritsa Cave, Greece
• Spilia Katafiki, Greece
• Spilia Katafygi, Greece
• Ghar Katalehkhor, Iran
• Katano ana, Japan
• Kåtavikens grottstig, Sweden
• Katavothres - Katabothres, Greece
• Katavothres, Greece
• Katerinska jeskyne, Czech Republic
• Katerloch, Austria
• Katflaap Catacombs, Molvanîa
• Kathu Mining Museum, Thailand
• Katla Ice Cave, Iceland
• Tombs of the Kings, Cyprus
• Katpatuka Cave Hotel, Turkey
• Kaumana Cave, United States of America
• Kaunos Kral Mezarları, Turkey
• Kaupo Ala, Latvia
• Kawachi Fuketsu, Japan
• Kaw Gon Cave, Myanmar
• Kawiti Glowworm Caves, New Zealand
• Kaw Ka Thaung Cave, Myanmar
• Kayadem Cave Hotel, Turkey
• Musée National des Mines, Luxembourg
• Kaymaklý Underground City, Turkey
• Kazanluk Tomb, Bulgaria
• Brouwerij De Kazematten, Belgium
• Kazumura Cave, United States of America
• Trypas Kefalas - Cave of Kefala, Greece
• Gua Kelam, Malaysia
• Gua Kelam 2, Malaysia
• Gua Kelawar, Malaysia
• Kelebek Hotel, Turkey
• Kelly Mine, Great Britain
• Kelly Hill Caves, Australia
• Keloğlan Mağarası, Turkey
• Cave of Kelpius, United States of America
• Kelvedon Hatch Secret Nuclear Bunker, Great Britain
• Command Bunker Kemmel, Belgium
• Kennecott Mine, United States of America
• Kennedy Mine, United States of America
• Kents Cavern, Great Britain
• Kentucky Caverns, United States of America
• Kentucky Coal Mining Museum, United States of America
• Caves of Keshcorran, Ireland
• Kesselfallklamm, Austria
• Keswick Mining Museum, Great Britain
• Magharet Kfar Him, Lebanon
• Khadzhokhskaya tesnina, Russia
• Tham Khamin, Thailand
• Khandagiri Cave, India
• Khangkhui Mangsor, India
• Tham Khao Khun Krathing, Thailand
• Tham Khao Kop, Thailand
• Tham Khao Kriep Ngoen, Thailand
• Tham Khao Luang, Thailand
• Tham Khao Ngoen, Thailand
• Tham Khao No, Thailand
• Khao Tham Phra, Thailand
• Khapra Kodiya Caves, India
• Khayon Cave, Myanmar
• Khewra Salt Mines, Pakistan
• Kh'ndzoresk, Armenia
• Tham Khuha Sawan, Thailand
• Kickapoo Cavern State Park, United States of America
• Kickapoo Indian Caverns, United States of America
• Muuseum Kiek in de Kök, Estonia
• Kiev Pechersk Lavra, Ukraine
• Besucherbergwerk Kilianstollen, Germany
• Killhope, Great Britain
• Killing Caves, Cambodia
• Kimberley Mine - Big Hole, South Africa
• Kimberley Underground Mining Railway, Canada
• Kimnyongsa Gul, South Korea
• Kin-nisshu-do, Japan
• King's Cave, Great Britain
• King Arthur's Labyrinth, Great Britain
• King Arthur's Cave, Great Britain
• King Edward Mine, Great Britain
• King George V Cave, Australia
• König-Otto-Tropfsteinhöhle, Germany
• King Solomon Cave, Australia
• King Solomon's Mines, Israel
• Gold Cave Café and Bonsai Garden, Japan
• Kinver Edge Rock Houses, Great Britain
• Kipina Monastery, Greece
• LKAB InfoMine Kiruna, Sweden
• Kish Underground City, Iran
• Kitley Show Cave, Great Britain
• Kittelsthaler Tropfsteinhöhle, Germany
• Kitum Cave, Kenya
• Kitzlochklamm, Austria
• Kiwengwa Caves, Tanzania
• Kiyotsu-kyō, Japan
• Kizil Caves, China
• Klackbergs Gruvfält, Sweden
• Kläfferquelle, Austria
• Bergbaumuseum Klagenfurt, Austria
• Kláštorská Roklina, Slovakia
• Klatovské katakomby, Czech Republic
• Klausenhöhle, Germany
• Kleine Berlin, Italy
• Besucherbergwerk Kleinenbremen, Germany
• Gletschergrotte Klein Matterhorn, Switzerland
• Kleinsteinhöhle, Germany
• Edukacyjna w Starej Kopalni Uranu w Kletnie, Poland
• Kleva gruva, Sweden
• Klodawa Salt Mine, Poland
• Podziemna Trasa Turystyczna 1000-Lecia Panstwa Polskiego w Klodzku, Poland
• Twierdza Klodzka, Poland
• Cave Church Klösterl, Germany
• Klosterstollen Barsinghausen, Germany
• Klusfelsen, Germany
• Kluterthöhle, Germany
• Knaben Gruvemuseum, Norway
• Knadel Cave Tour, Morocco
• Knalla gruvmuseum, Sweden
• Lausitzer Bergbaumuseum Knappenrode, Germany
• Schachtanlage Knesebeck, Germany
• Knife River Coal Mine & Bucket Site, United States of America
• Kőbányai pincerendszer, Hungary
• Kristallhöhle Kobelwald, Switzerland
• Legaga la ga Kobokwe, Botswana
• Koboriya shonyudo, Japan
• Kocaín Mağarası, Turkey
• Besucherbergwerk in Bad Friedrichshall-Kochendorf, Germany
• Kocherursprung, Germany
• Kalkbergwerk am Königsberg, Germany
• De Beers Open Mine, South Africa
• Kohlerhöhle, Austria
• Kohtla-Järve Põlevkivimuuseum, Estonia
• Kojima Kurago, Japan
• Kokopelli's Cave, United States of America
• Kolar Gold Fields, India
• Kolbinger Höhle, Germany
• Kolowrathhöhle, Austria
• Komakado Fuketsu, Japan
• Komati Gorge, South Africa
• Kom es-Shouqafa, Egypt
• Komori kutsu, Japan
• Kompong Trach Cave, Cambodia
• Konĕpruské jeskyně, Czech Republic
• Tham Kong Lor, Laos
• Norsk Bergverksmuseum Kongsberg, Norway
• Konispol Cave, Albania
• Konnerud Gruver, Norway
• Schacht Konrad, Germany
• Konungastollen, Sweden
• Koori-ana, Japan
• Wombeyan Caves - Kooringa Cave, Australia
• Podziemne Muzeum "Kopalnia Zlota" w Zlotym Stoku, Poland
• Stora Kopparberget, Sweden
• Koppartorp, Sweden
• Koppenbrüllerhöhle, Austria
• Kamara tou Koraka Natural Bridge, Cyprus
• Korallgrottan, Sweden
• Korkinsk Coal Mine, Russia
• Korsanini Mağarası, Turkey
• Korykio Andro - Corycian Cave, Greece
• Slovenské Technické Múzeum, Slovakia
• Kostanjevica Jama, Slovenia
• Kounoubwa Cave, Haiti
• Kourtaliotiko Gorge, Greece
• Spilia Koutouki - Koutouki Cave, Greece
• Sztolnie Kowary, Poland
• Kow Ata Underground Lake, Turkmenistan
• Peshtera Kozarnika, Bulgaria
• Slap Kozjak, Slovenia
• Wat Tham Krabok, Thailand
• Králova jeskynĕ, Czech Republic
• Rovi pod starim Kranjem, Slovenia
• Krapina Cave, Croatia
• Tham Krasae, Thailand
• Krasnaja pestera, Russia
• Krasnohorska Jaskyna, Slovakia
• Krasny Klutch Spring, Russia
• Kraushöhle, Austria
• Kreidelucke, Austria
• Karstlehrpfad Krippenstein, Austria
• Kristallgänge, Germany
• Kristalnaja pestera, Ukraine
• Kristinebergs gruva, Sweden
• Krizna Jama, Slovenia
• Nacionalni park Krka, Croatia
• Skansen Górniczy "Królowa Luiza" w Zabrzu, Poland
• Kromdraai Gold Mine, South Africa
• Krompirjeva Jama, Slovenia
• Castello di Mezzocorona, Italy
• Höhlenburg Kropfenstein, Switzerland
• Graphitbergwerk Kropfmühl, Germany
• Krška jama - izvir Krke, Slovenia
• Krug, France
• Krushuna, Bulgaria
• Kryt 10 - Z, Czech Republic
• Kryt Denis, Czech Republic
• Prahistoryczne Kopalnie Krzemienia w Krzemionkach, Poland
• Kuang Si Falls, Laos
• Kubacher Kristallhöhle, Germany
• Kühlloch, Austria
• Fiery Caves of Kuhi-Malik, Tajikistan
• Kuhstall, Germany
• Kula Kai Caverns, United States of America
• Eshab-ı Kehf Kulliye, Turkey
• Kulturbunker Barbarastollen, Germany
• 'Ana Kuma, Tonga
• Kumaso ana, Japan
• Kumganggul, South Korea
• Kumistavi Cave, Georgia
• Kuna Cave, United States of America
• Kundum Cave, Bangladesh
• Kungur ledenica pestera, Russia
• Kunming Natural History Museum of Zoology, China
• Historischer Kunstbunker, Germany
• Izvor Kupe, Croatia
• Kupferberg Museum, Germany
• Bergbau-Museum Kupferberg, Germany
• Schaubergwerk Kupferplatte, Austria
• Kurjey Lhakhang, Bhutan
• Kurobe Gorge, Japan
• Hrádek a důl Osel Kutná Hora, Czech Republic
• Kutumsar Gufa, India
• Kverkfjöll, Iceland
• Kvernufoss, Iceland
• Kyat Khayon Cave Monastery, Myanmar
• Kyrk Gyz Cave, Turkmenistan
• Kyusen-do, Japan
• Kyzyl-Yar Cave, Russia
• Laas Gaal, Somalia
• La'auolola Caves, Samoa
• Grotte de Labastide, France
• Grotte de Labeil, France
• Budavári Labirinthus, Hungary
• Riv. Souterraine de Labouiche, France
• Labyrinth pod Zelným trhem, Czech Republic
• Lac Souterrain St-Léonard, Switzerland
• Mina De Oro La Carolina, Argentina
• Grotte de Lacave, France
• Restaurant La Cave, France
• Laguna Lachua, Guatemala
• Lackawanna Coal Mine Tour, United States of America
• La Claustra Hotel, Switzerland
• La Coupole, France
• Bunker Ladeburg, Germany
• Lærdalstunnelen, Norway
• Caverne Laflèche Caves, Canada
• La Fuente, Panama
• Gruta da Lage Branca, Brazil
• Gruta do Lago Azul, Brazil
• LagOmar, Spain
• Lago di Telese, Italy
• La Gruta, Panama
• La Gruta, México
• Laguna Cave, Belize
• Laichinger Tiefenhöhle, Germany
• Margaret River Caves - Lake Cave, Australia
• Lake Shasta Caverns, United States of America
• Lalibela, Ethiopia
• Musée de la Mine à La Machine, France
• Lama La Vita, Italy
• Grotta Lamalunga, Italy
• Lammeröfen, Austria
• Grottes de Lamouroux, France
• Grotta dei Lamponi, Italy
• Lamprechtsofen, Austria
• Gruta da Lancinha, Brazil
• Hornické muzeum OKD Landek, Czech Republic
• Landgrafenschlucht, Germany
• Landmannahellir, Iceland
• Batteri Landsort, Sweden
• Lang's Cave, Malaysia
• Langbans Mines, Sweden
• Höhlenwohnungen in Langenstein, Germany
• Kupferschieferbergwerk Lange Wand, Germany
• NOAH Langøya, Norway
• Lanner Gorge, South Africa
• Lanquín Caves, Guatemala
• Lanson, France
• Lao Mei, China
• Virgem da Lapa, Brazil
• Gruta Lapa Doce, Brazil
• Gruta da Lapa Grande, Brazil
• Gruta do Lapão, Brazil
• Cueva de La Peña, Spain
• Gruta da Lapinha, Brazil
• Les Lapidiales, France
• Għar Lapsi, Malta
• Fort Troglodytique de La Roque Gageac, France
• Historische Kupferzeche am Larzenbach, Austria
• La Salina, Spain
• Grotte de Lascaux, France
• Las Cuevas, Spain
• Cueva de las Manos, Argentina
• Las Médulas, Spain
• Cueva de Las Palomas, Spain
• Last Chance Mining Museum, United States of America
• Cueva de la Lastrilla, Spain
• Latomie, Italy
• Abri de Laugerie-Haute, France
• Launois Père & Fils, France
• Laurel Caverns, United States of America
• Cavernas de Laurel, Perú
• Laurent-Perrier, France
• Grotte des Lauriers, France
• Historisches Silberbergwerk Lautenthals Glück, Germany
• Lava Beds Caves, United States of America
• La Valette Underground Military Museum, Great Britain
• Lava River Cave - Newberry National Volcanic Monument, United States of America
• La salle de La Verna, France
• Grotte de Laveuses, France
• Tham Lawa, Thailand
• Goa Lawah, Indonesia
• Laxey Wheel, Great Britain
• Layser Cave, United States of America
• Leamington Caves, Bermuda
• Lebanon Silver Mine, United States of America
• Salzbergwerk von Bex, Switzerland
• Le Caveau, France
• Lechuguilla, United States of America
• Cueva de la Lechuzas, Perú
• Ledenika, Bulgaria
• Ledge View Nature Center, United States of America
• Ledová jeskynĕ, Czech Republic
• Technisches Denkmal Historischer Schieferbergbau Lehesten, Germany
• Lehman Caves, United States of America
• Leichtweißhöhle, Germany
• Leiðarendi, Iceland
• Musée de la Mine Le Molay Littry, France
• Volcan de Lemptégy, France
• Eisenerzgrube Lengede-Broistedt, Germany
• Grube Lengenbach, Switzerland
• Lenore Caves, United States of America
• Schaubergwerk Leogang, Austria
• Grube Leonie, Germany
• Le Prince Noir, France
• Musée National de Préhistoire, France
• Les Maisons de Cappadoce, Turkey
• Les Terrasses d'Uchisar, Turkey
• Grotta di S. Angelo di Lettomanoppello, Italy
• Leutasch-Klamm Wasserfallsteig, Austria
• Leveäniemigruvan, Sweden
• Leviathan Lava Tube, Kenya
• Levon’s Divine Underground, Armenia
• Centre Historique Minier Lewarde, France
• Lewis and Clark Caverns State Park, United States of America
• Lewis Merthyr Colliery, Great Britain
• Pertouse de Leytro, Switzerland
• Li'angahuo 'a Maui, Tonga
• Liang Bua Cave, Indonesia
• Lībiešu upuralas, Latvia
• Liboriusklause, Germany
• Lice Ashâb-ı Kehf Mağarası, Turkey
• Lidbergsgrottorna, Sweden
• Carrières de la Lie, France
• Liechtensteinklamm, Austria
• Lighthouse Cave, Bahamas
• Peştera Liliecilor, Romania
• Rimstone Pools of the Lillach River, Germany
• Lima Catacombs, Perú
• Limestone Caves, Australia
• Grotte de Limousis, France
• Lincoln Caverns, United States of America
• Grotte de Lindéralique, New Caledonia
• Linggu Dong, China
• Lingqi Karst Cave, China
• Ling Shan Cave, China
• Linkenboldhöhle, Germany
• Linno Gu, Myanmar
• Lintvern, Slovenia
• Linville Caverns, United States of America
• Lion Salt Works, Great Britain
• Lipci Cave, Montenegro
• Lippoldshöhle, Germany
• Lipska Pecina, Montenegro
• Podzemie pod vežami, Slovakia
• Lisboa Roman Galleries, Portugal
• Source du Lison, France
• Liss Ard, Ireland
• Lithgow State Mine, Australia
• Gruvemuseet på Litlabø, Norway
• Litli Björn - Vörðuhellir, Iceland
• Zámecké sklepení Litomyšl, Czech Republic
• Fort de Litroz, Switzerland
• Little American Mine, United States of America
• Little Hustan Cave, Canada
• Liuku Show Cave, China
• LKAB Gruvmuseum, Sweden
• Cueva de Llamazares, Spain
• The Welsh Slate Museum, Great Britain
• Chwarel Hên Llanfair, Great Britain
• Cuevo del Llanos, Spain
• Llechwedd Slate Cavern, Great Britain
• Llewelyn's Cave, Great Britain
• Llywernog Silver-Lead Mine Museum, Great Britain
• Local Cave House, Turkey
• Höhlenburg Loch, Germany
• Lockgruvan, Sweden
• Lockport Cave Raceway Tour, United States of America
• Locso-on Cave, Philippines
• Lóczy barlang, Hungary
• Tham Lod, Thailand
• Lötschberg-Basistunnel, Switzerland
• Loizos Cave, Greece
• Lojzova Jama, Slovenia
• Jaskinia Łokietka, Poland
• Gammelgruva Løkken, Norway
• Špilja Lokvarka, Croatia
• Grutas de Lol-Tún, México
• Lomax Placer Mine, United States of America
• Grotte de Lombrives, France
• London Underground, Great Britain
• Lonetopf, Germany
• Loneversickerung, Germany
• Longgong Caves, China
• Longhorn Caverns, United States of America
• Longkong Dong, China
• Long Men Dong, China
• Longmen Grottoes, China
• Longquan Cave, China
• Long Tunnel Extended Gold Mine, Australia
• Longyearbreen Grotte, Norway
• Longyou Caves, China
• Loos Koboltgruva, Sweden
• Cueva de Los Pajaritos, Argentina
• Lost Mine, United States of America
• Lost Lake, United States of America
• Lost River Caverns, United States of America
• Lost River Cave and Valley, United States of America
• Lost Sea, United States of America
• Lost World Caverns, United States of America
• The Lost World, New Zealand
• Cueva de Los Verdes, Spain
• Lotus Cave, China
• Source de la Loue, France
• Loughareema, Ireland
• Mina subterrânea de Sal-Gema de Loulé, Portugal
• Museu Mineiro do Lousal, Portugal
• La Louvière, Belgium
• Love Bridge, Cyprus
• LowLine, United States of America
• Tham Luang Nang Non, Thailand
• Tham Luang Pha Wiang, Thailand
• Lubang Jepang, Indonesia
• Lublova Torturak, Molvanîa
• Lúčansky Vodopád, Slovakia
• Jenolan Caves - Lucas Cave, Australia
• Lucca City Walls Basement, Italy
• Cueva del Lucero, Puerto Rico
• Museo de La Lucha Obera, México
• Ludi Yan - Reed Flute Cave, China
• Ludvika Gruvmuseum, Sweden
• Ludwigshöhle, Germany
• Ludwigsklamm, Germany
• Lügenstein, Germany
• Luegstein Höhle, Germany
• Lugnås Minnesfjäll, Sweden
• Museo Mineralogico Luigi Celleri, Italy
• Grotte de la Luire, France
• Gruta Luminosa, Brazil
• Lummelundagrottan, Sweden
• Luobi Cave, China
• Museo ng Libingan sa Ilalim ng Lupa, Philippines
• Lupercale, Italy
• Luray Caverns, United States of America
• Lurgrotte Peggau, Austria
• Lurgrotte Semriach, Austria
• Lusk Cave, Canada
• Grottes de Lustin, Belgium
• Luzit Caves, Israel
• Lydford Gorge, Great Britain
• Lydstep Caverns, Great Britain
• Spilaio Aggitis, Greece
• Maastricht Kazematten, Netherlands
• Mabaj Cave, Lebanon
• Macahambus Cave, Philippines
• Museu Vulcanoespeleológico "Machado Fagundes", Portugal
• Ma'arat HaMachpelah, Israel
• Mackinac Island State Park, United States of America
• Propast Macocha, Czech Republic
• Macraes Mine, New Zealand
• Grotte de la Madelaine, France
• Abri la Madelene, France
• Grotta della Madonna, Italy
• Madonna della Grotta, Italy
• Santuario della Madonna della Grotta di Bombile, Italy
• Santuario della Madonna della Grotta, Italy
• Chiesa Cripta Madonna della Grotta, Italy
• Madonna della Corona, Italy
• Gua Madu, Malaysia
• Tham Mae Lana, Thailand
• Maeshowe, Great Britain
• Tham Mae Usa, Thailand
• Tham Mae Usu, Thailand
• Magili, Armenia
• Magnanerie de Bourré, France
• Farmacia del Mago Greguro, Italy
• Magura, Bulgaria
• Mahabalipuram Caves, India
• Mahendra Gupha, China
• Mahendra Guffa, Nepal
• Mahendravadi Cave Temple, India
• Mailly Grand Cru, France
• Maimu Cave, Estonia
• Maison Forte, France
• Cueva de la Majahua, México
• Majlis Al-Jin, Oman
• Makauwahi Cave, United States of America
• Maki-do, Japan
• Malå Geo Museum, Sweden
• Tham Malai, Thailand
• Malá Pravčická Brána, Czech Republic
• Le Scialet de Malaterre, France
• Malinta Tunnel, Philippines
• Malmberget Iron Mine, Sweden
• Carrières souterraines de la Malogne, Belgium
• Malovaný sklep, Czech Republic
• Sentier Karstique des Malrochers, France
• Cueva de Maltravieso, Spain
• Rokle Malý Kyseľ, Slovakia
• Jama Mamet, Croatia
• Mammoth Spring, United States of America
• Mammoth Cave National Park, United States of America
• Margaret River Caves - Mammoth Cave, Australia
• Mammoth Hot Springs, United States of America
• Dachstein-Mammuthöhle, Austria
• Grutas del Mamut, México
• Manazan Mağaraları, Turkey
• Manchester Cave, United States of America
• Caverna da Mandaçaia, Brazil
• Gruta da Mangabeira, Brazil
• Minas de Manganeso de Puras de Villafranca, Spain
• Mangapwani Slave Cave, Tanzania
• Mangapwani Coral Cavern, Tanzania
• MangupKale, Russia
• Manita pećina, Croatia
• Manitou Cliff Dwellings, United States of America
• Manjang Gul, South Korea
• Manjushree Gufa, Nepal
• Mansfeld Museum, Germany
• Grotta Maona, Italy
• Maori Leap Cave, New Zealand
• Mapu’a a Vaea, Tonga
• Gruta do Maquiné, Brazil
• Maquoketa Caves State Park, United States of America
• Marakoopa Cave, Australia
• Maramagambo Caves, Uganda
• Mar Antonios Kozhaya, Lebanon
• Deir Mar Antonios, Egypt
• Grotta di Maratea, Italy
• Maratika Gufa, Nepal
• Grutas de las Maravillas, Spain
• Cueva de las Maravillas, Dominican Republic
• Marble Arch Caves, Ireland
• Domaine de Marc Brédif, France
• Le musée de la Mine Marcel Maulini, France
• Cuevas de la Mare de Deu, Spain
• Marengo Cave National Landmark, United States of America
• Vai Marere, Cook Islands
• Maresha, Israel
• Margate Caves, Great Britain
• Margate Grotto, Great Britain
• Cave à Margot, France
• Baños de Doña María de Padilla, Spain
• Gruta da Maria Encantada, Portugal
• Miniexpozíca Ťažby a Spracovania Bridlice v Marianke, Slovakia
• Maribel New Hope Cave, United States of America
• Marie-Jeanne Cave, Haiti
• Besucherbergwerk Marie Louise Stolln, Germany
• Marienglashöhle, Germany
• Marienschlucht, Germany
• Štoly Marie pomocná a Koňská jáma, Czech Republic
• Ristorante Grotta Marinara, Italy
• Markt Höhler, Germany
• Mark Twain Cave, United States of America
• Besucherbergwerk Markus Semmler, Germany
• Monastery of Mar Lishaa, Lebanon
• Marmarospilia, Greece
• Catedral de Marmol, Chile
• Caverna do Maroaga, Brazil
• Domačija Marof, Slovenia
• Maropeng, South Africa
• Les Caves de Marson, France
• Marstrand Caves, Sweden
• G.H. Martel et C°, France
• Martha Mine, New Zealand
• Martinsloch, Switzerland
• Marvel Cave, United States of America
• Mary Campbell Cave, United States of America
• Mary King's Close, Great Britain
• Aven de Marzal, France
• Miniera Marzoli, Italy
• Múzeum baníctva a hutníctva Maša, Slovakia
• Mascot Mine, Canada
• Cuevas del Masical, Honduras
• Rifugio Antiaereo Martana, Italy
• Grotto of Massabielle, France
• Museo della Miniera Massa Marittima, Italy
• Museo di Arte e Storia delle Miniere, Italy
• Maison des Pierreux de Massangis, France
• Miniera di Masua, Italy
• Minas de Matahambre, Cuba
• Matala Caves, Greece
• Grottes de Matata, France
• Tham Mat Cha Pla Won, Thailand
• Matchless Mine, United States of America
• The Cave Homes of Matmâta, Tunisia
• Grotta Matromania, Italy
• Matsushiro Underground Imperial Headquarters, Japan
• Jaskyňa mŕtvych netopierov, Slovakia
• Mátyáshegy barlang, Hungary
• Mau Mau Caves, Kenya
• Mauna Loa Tree Molds, United States of America
• Důl Mauritius, Czech Republic
• Mavri Spilia - Black Cave, Greece
• Mavri Spilia - Black Cave, Greece
• Krem Mawsmai, India
• Grottes de Maxange, France
• Maximiliansgrotte, Germany
• Maximushöhle - The "Catacombs" of Salzburg, Austria
• Mayener Grubenfeld, Germany
• Mazi Underground Settlement, Turkey
• McConnell Springs, United States of America
• Meadowcroft Rockshelter, United States of America
• Jaskinia w Mechowie, Poland
• Mecsek Bányászati Múzeum, Hungary
• Gruta de la Virgen de la Medalla Milagrosa, Argentina
• Medicine Rocks State Park, United States of America
• Grotte de Médous, France
• Medvedia štôlňa, Slovakia
• Medvidina špilja, Croatia
• Höhler von Meerane, Germany
• Louisville Mega Cavern, United States of America
• Megali Spilia, Greece
• Mega Spiléo - The Great Cave, Greece
• Mejiro-do, Japan
• Melek-Chesmensky Kurgan, Russia
• Spilaio tou Melidoniou, Greece
• Limni Melissani, Greece
• Musée des Mines d'Argent des Rois Francs, France
• Mellieħa Cave and Spring, Malta
• Mělnické Podzemí, Czech Republic
• Mendenhall Ice Caves, United States of America
• Cueva de Mendukilo, Spain
• Menfudo shonyudo, Japan
• Cuevas de Menga y Viera, Spain
• Meramec Caverns, United States of America
• Grotte delle Meraviglie, Italy
• Mercer Caverns, United States of America
• Mercier, France
• Grotte de la Mer de Glace, France
• Sentier Karstique du Grand Bois, France
• Erlebnis Bergwerk Merkers, Germany
• Merlin's Cave, Great Britain
• Mermaid’s Lair Cave, Bahamas
• Mermerna Pecina, Serbia
• Pozzo del Merro, Italy
• Grotte Prehistorique des Merveilles, France
• Grotte Merveilleuse, Algeria
• Grotte La Merveilleuse, Belgium
• Mesa Arch, United States of America
• Mesa Verde NP, United States of America
• Grottes de Beaume les Messieurs, France
• Mészégető-forrásbarlang, Hungary
• Trassbergwerk Meurin, Germany
• Die Meyerschen Stollen, Switzerland
• Le Grand Canyon de Meyrangle, France
• Peştera Meziad, Romania
• Rudnik svinca in cinka Mežica, Slovenia
• Mezmaiskaya Cave, Russia
• Důl Michal, Czech Republic
• Micheongul, South Korea
• La Micoque, France
• Miedzyrzecki Rejon Umocniony, Poland
• Mikaelshulen, Norway
• Grotte de Milandre, Switzerland
• Milarepa's Cave, China
• Milatos Andron, Greece
• Mileştii Mici, Moldova
• Milk Grotto Chapel, Israel
• Millennium Underground Museum, Hungary
• Millie Mine Bat Cave, United States of America
• Aguas Turquesas Millpu, Perú
• Cueva del Milodon, Chile
• Milton House, United States of America
• La Forteresse de Mimoyecques, France
• Museo de la Mineria, México
• Cueva de Las Minas, Guatemala
• Mincmistrovský sklep, Czech Republic
• Mindemoya Cave, Canada
• Mine Howe, Great Britain
• Minera Lead Mines, Great Britain
• Museo dei Minerali Elbani, Italy
• Mineraliengrotte Vorderkrimml, Austria
• Miners' Dugouts, Australia
• Miners Heritage Walk-In Mine, Australia
• Ponts Naturels à Minerve, France
• Mines & Meadows ATV Riding Resort, United States of America
• Mines View Park, Philippines
• Minigill Cave, Canada
• Minnesota Museum Of Mining, United States of America
• Smaragdgruvene Byrud Gård, Norway
• Minnetonka Cave, United States of America
• Minntac Plant, United States of America
• Mintaro Slate Quarries, Australia
• Mir Diamond Mine, Russia
• Grutas de Mira de Aire, Portugal
• Polje de Mira-Minde, Portugal
• Miskolc-Tapolca, Hungary
• Mission Mine, United States of America
• Cave Creek Mistress Mine, United States of America
• Mitchell Caverns, United States of America
• Mitchells Gully Gold Mine, New Zealand
• Mitchelstown Cave, Ireland
• Mithraeum, Italy
• Mithraeum San Clemente, Italy
• Mitsugo shonyudo, Japan
• Mittelbau Dora - Mittelwerk Dora, Germany
• Miyama Shonyudo, Japan
• Mizamiza Cave, Tanzania
• Mizonoguchi dokutsu, Japan
• Mladečské jeskyně, Czech Republic
• Mlynky Cave, Ukraine
• Moaning Caverns, United States of America
• Missouri Botanical Garden, United States of America
• Izviri v Močilnik, Slovenia
• Modlivý důl, Czech Republic
• Modra Spilia - Blue Grotto, Croatia
• Modrić Špilja, Croatia
• Grutas da Moeda, Portugal
• Mønsted Kalkgruber, Denmark
• Moët & Chandon, France
• Mogok Gem Mines, Myanmar
• Grotte des Moidons, France
• La Cave Aux Moines, France
• Mokolea Lava Pools, United States of America
• Muzeum vltavínů, Czech Republic
• Pulo di Molfetta, Italy
• Puig des Molins Nekropolis, Spain
• Mollie Kathleen Mine, United States of America
• Museum of Old and New Art, Australia
• Món De Sal, Spain
• Monfort Bat Cave, Philippines
• Karstlehrpfad Monheimer Alb, Germany
• Monks' Prison, Greece
• Les Caves Monmousseau, France
• Monsanto, Portugal
• Montagu Guano Cave, South Africa
• Parco Minerario del Monte Amiata, Italy
• Grotta del Monte Capriolo, Italy
• Museo delle Miniere di Montecatini, Italy
• Grotta di Monte Cucco, Italy
• Montelimar Cave, Nicaragua
• Miniera Monteponi, Italy
• Monte Sant'Angelo sul Gargano, Italy
• Miniera Montevecchio, Italy
• Grotta di Montevicoli, Italy
• Montezuma Castle National Monument, United States of America
• Montezuma Well, United States of America
• Grotte de Mont-Fat, Belgium
• Grotte de Montgaudier, France
• La Ville Souterraine, Canada
• Montreal Goldfield, Australia
• Santa Cova de Montserrat, Spain
• Cisternas Romanas de Monturque, Spain
• Temple of the Moon, Peru
• Margaret River Caves - Moondyne Cave, Australia
• Moon Water Cave, China
• Tunnels of Moose Jaw, Canada
• Moqui Cave, United States of America
• Moqui Sand Caves, United States of America
• Tham Morakot, Thailand
• Schaubergwerk Morassina, Germany
• Morden Colliery, Canada
• Mordloch, Germany
• Morefield Gem Mine, United States of America
• Morenci Mine, United States of America
• Cueva de Morgan, Colombia
• Grottes de Morgat, France
• Besucherstollen Morgenstern, Germany
• Morgia Sant'Angelo, Italy
• Khazad-dûm, Middle-Earth
• Caverna do Morro do Couto, Brazil
• Morro do Ouro, Brazil
• Caverna do Morro Preto, Brazil
• Tunnel du Mortier, France
• Morwellham Quay, Great Britain
• Moscow Metro, Russia
• Mo So Cave, Vietnam
• Mother Shipton's Cave, Great Britain
• Motuanga Cave, Cook Islands
• Les Moulins Souterrains du Col-des-Roches au Locle, Switzerland
• Grotte de Moulis, France
• Laboratoire Souterrain de Moulis, France
• Cave of the Mounds, United States of America
• Mountain Maid Gold Mine, Australia
• Moun Ta Wa Cave, Myanmar
• Mount Lyell Copper Mine, Australia
• Cova dos Mouros, Portugal
• Abri du Moustier, France
• Peştera Movile, Romania
• Mozrovi, Armenia
• Mramornaja, Russia
• Špilja Mramornica, Croatia
• Jaskinia Mroźna, Poland
• Bergbau- und Heimatmuseum Mühlbach, Austria
• Mühlbachquellhöhle, Germany
• Spring von Mühlberg, Germany
• Mühlheimer Höhle, Germany
• Alaunwerk Mühlwand, Germany
• Peştera Muierilor, Romania
• Mulgol Cave, South Korea
• Wombeyan Caves - Mulwaree Cave, Australia
• Mumba Rockshelter, Tanzania
• G.H. Mumm, France
• Muqattam Mountain Cave Cathedral, Egypt
• Cueva de los Murciélagos, Spain
• Murrindal Caves, Australia
• Musanze Cave, Rwanda
• Musée du Vin, France
• Musejnaja, Russia
• Museo Arqueológico, Spain
• Museo civico archeologico del Distretto minerario, Italy
• Museo Canario, Spain
• Museu de Minas Ouro Prêto, Brazil
• Museu de Temàtica Espeleològica, Spain
• Slovenské múzeum ochrany prírody a jaskyniarstva, Slovakia
• Museum of Caves, New Zealand
• Museum Hotel, Turkey
• Cistern of Ancient Mycenae, Greece
• Jaskinia Mylna, Poland
• Rock-cut Tombs in Myra, Turkey
• Mystery Cave, United States of America
• Mystic Caverns, United States of America
• Zeche Nachtigall, Germany
• El Nacimiento, México
• Ledová Jeskyně Naděje, Czech Republic
• Izvir Nadiže, Slovenia
• Nagarjuna Caves, India
• Nahal Me’arot Caves, Israel
• Cenote Naharon, México
• Nahehe Cave, Fiji
• Naica Crystal Caves - Cueva de las Espadas - Cueva de los Cristales, México
• Naj Tunich, Guatemala
• Nakalele Blowhole, United States of America
• Nakatonbetsu Limestone Cave, Japan
• Nakilbent Sarnıçı, Turkey
• Nakimu Caves, Canada
• Nakoroloaloa Cave, Fiji
• Tham Nam Bang, Thailand
• Goldbergwerk Name Gottes, Germany
• Nammongyi Blue Lagoon, Myanmar
• Tsingy de Namoroka, Madagascar
• Nanaimo Museum, Canada
• Nanaori shonyudo, Japan
• Nanatsugama shonyudo, Japan
• La Cité Souterraine de Naours, France
• Grotte de Napoléon, France
• Museo del Sottosuolo Napoletano, Italy
• Napoli Sotterranea, Italy
• Jeskyne Na Pomezi, Czech Republic
• Miniera di Naracauli, Italy
• Narni Sotterranea, Italy
• Narusawa Fuketsu, Japan
• Narva Victoria Bastioni kasematid, Estonia
• Nascente Azul, Brazil
• Nashoba Brook Stone Chamber, United States of America
• Jeskyně Na Špičáku, Czech Republic
• Gruta do Natal, Portugal
• National Coal Mining Museum for England, Great Britain
• Národi Technické Muzeum, Czech Republic
• Grotto of the Nativity, Israel
• Natural Bridge Caverns, United States of America
• Natural Bridge Caverns, United States of America
• Caverns at Natural Bridge, United States of America
• Natural Stone Bridge and Caves, United States of America
• Natural Tunnel, United States of America
• Naung Mya Hlwe Cave, Myanmar
• Navenakhevi Cave, Georgia
• Naypyitaw Gem Museum, Myanmar
• Neanderthal, Germany
• Nebelhöhle, Germany
• Necromanteion of Ephyra, Greece
• Nederland Mining Museum, United States of America
• Needle's Eye, United States of America
• Neitsikoobas, Estonia
• Nemo 33, Belgium
• Mina de Sal de Nemocón, Colombia
• Nenthead Mines Heritage Centre, Great Britain
• Grottes de Neptune, Belgium
• La Cueva de Nerja, Spain
• Nesmith Cave, United States of America
• Spílio tou Nestóros - Nestor's Cave, Greece
• Netherton Tunnel Branch Canal, Great Britain
• Nettle Cave, Australia
• Grotte di Nettuno, Italy
• Neubulach - Hella-Glück-Stollen, Germany
• Musée des Mines de Fer de Neufchef, France
• Karstkundlicher Wanderweg Neuhaus/Pegnitz, Germany
• Neustädtler Hobbybergwerk, Germany
• Newdegate Cave, Australia
• Newgrange, Ireland
• New Mexico Mining Museum, United States of America
• Newnes Glow Worm Tunnel, Australia
• Nezhnaya Cave, Russia
• Ngarua Caves, New Zealand
• Ngilgi Cave, Australia
• Nguom Ngao Cave, Vietnam
• Nhi Thanh Cave, Vietnam
• Niagara Cave, United States of America
• Gua Niah, Malaysia
• Niasar, Iran
• Grotte de Niaux, France
• La Crypte Archéologique de Nice, France
• Grottes de Nichet, France
• Nidlenloch, Switzerland
• Niedaltdorfer Tropfsteinhöhle, Germany
• Jaskinia Niedźwiedzia, Poland
• Jaskinia Nietoperzowa, Poland
• Nigardsbreen Ice Cave, Norway
• Fortress of Niha, Lebanon
• Nikau Cave, New Zealand
• Die historische Grotte in den Herrenhäuser Gärten, Germany
• St Ninian's Cave, Great Britain
• Għar Ninu, Malta
• Nippara shonyudo, Japan
• Niter Ice Cave, United States of America
• Pigeonnier de la Niverdière, France
• Cave Nivida, Panama
• Nixhöhle, Austria
• Nixseebecken, Germany
• Banícka a geologická expozícia v Nižnej Slanej, Slovakia
• The No. 9 Mine & Museum, United States of America
• Noccalula Falls, United States of America
• Nodong Cave, South Korea
• Nohoch Nah Chich, México
• Nõiakaev, Estonia
• Noirmont Command Bunker, Great Britain
• Nonsuch Caves, Jamaica
• Noravank, Armenia
• Gruvmuseet Norberg, Sweden
• Nordmarks museum, Sweden
• Grotte de la Noré, France
• North Glory Hole, Australia
• North Head Tunnels, New Zealand
• Norwich Guildhall Crypt, Great Britain
• Farkaskői Alkotótelep, Hungary
• Nothklamm, Austria
• Eisenerzgrube Nothweiler, Germany
• Notranjski muzej Postojna, Slovenia
• Notre Dame du Scex, Switzerland
• The Caves of Nottingham, Great Britain
• Pohronské múzeum Nová Baňa, Slovakia
• Parco Fluviale Novella, Italy
• Novoafonskaya, Georgia
• Muzeum Gornictwa Podziemnego w Nowej Rudzie, Poland
• National Stone Centre, Great Britain
• Null Stern Hotel, Switzerland
• Grotta Nuova, Italy
• Underground City of Nushabad, Iran
• Nutty Putty Cave, United States of America
• Amabera ga Nyinamwiru, Uganda
• Grotte aux Nymphes, Switzerland
• Nyvångs kolgruva, Sweden
• Oberharzer Bergwerksmuseum, Germany
• Gipsbergwerk Oberwiesen, Switzerland
• Bergbau- und Mineralienmuseum Oberwolfach, Germany
• Historische Silbergruben Oberzeiring, Austria
• Obir Tropfsteinhöhlen, Austria
• WISMUT Objekt 90, Germany
• Obodska Cave, Montenegro
• Grotte de l'Observatoire, France
• Ocean Hole, Bahamas
• Ochozská jeskynĕ, Czech Republic
• Ochtinska Aragonitova Jaskyna, Slovakia
• Wasserbaum von Ockensen, Germany
• Mina de Visitação Octávio Fontana, Brazil
• Odaira shonyudo, Japan
• Odelsteinhöhle, Austria
• Odessa Catacombs, Ukraine
• Odin Mine, Great Britain
• Öblarner Kupferweg, Austria
• Bergbaumuseum Oelsnitz, Germany
• Ötscher Tropfsteinhöhle, Austria
• Ötschergräben, Austria
• Ofnethöhlen, Germany
• Ogba Ogbunike, Nigeria
• Ohio Caverns, United States of America
• Ohtake shonyudo, Japan
• Ohtaki shonyudo, Japan
• Uamh an Oir, Great Britain
• Oja de Agua, México
• Ojika-do, Japan
• Ojo de Agua, México
• Ojo Guareña, Spain
• Ojukwu Bunker, Nigeria
• Caverna de la Olada, Perú
• Old Dominion Mine Park, United States of America
• Old Hundred Gold Mine Tour, United States of America
• Old New-Gate Prison & Copper Mine, United States of America
• Old Spanish Treasure Cave, United States of America
• Old Timers Mine, Australia
• Old Water Wheel, Australia
• O'Leno State Park, United States of America
• Olentangy Indian Caverns, United States of America
• Olgahöhle, Germany
• Grotte di Oliero, Italy
• Spilia Olimbi, Greece
• Olla Quemada, Costa Rica
• Olumo Rock, Nigeria
• Olympic Dam Mine, Australia
• Gorges d'Ombleze, France
• Omuru Flying Fox Cave, Papua New Guinea
• Onagara shonyudo, Japan
• Cueva de Oñati-Arrikrutz, Spain
• Ondaldong Gul, South Korea
• Oneota Gorge, United States of America
• Las grutas de Ongamira, Argentina
• Onondaga Cave, United States of America
• Onyx Cave at Guntown Mountain, United States of America
• Onyx Cave Park, United States of America
• Slovenské Opálové Bane, Slovakia
• Oparara Arch, New Zealand
• Podziemia Opatowskie w Opatowie, Poland
• Oppenheimer Kellerlabyrinth, Germany
• Orakei Korako, New Zealand
• Gorges de l'Orbe, Switzerland
• L'Orbiere, France
• Ordinskaya Peschtera, Russia
• Oregon Caves, United States of America
• Organ Cave, United States of America
• Aven d'Orgnac, France
• Oribi Gorge, South Africa
• Jenolan Caves - Orient Cave, Australia
• Orlovaca Cave, Bosnia and Herzegovina
• Orlova Čuka, Bulgaria
• Grottes de Ornolac, France
• Cueba de Oro, Philippines
• Oroszlány Bányász Múzeum, Hungary
• Orphan Girl Mine, United States of America
• La Grotta dell'Orso, Italy
• Orvieto, Italy
• Museum Industriekultur Osnabrück, Germany
• Senda del Oso, Spain
• Osowka Complex, Poland
• Grotte d'Osselle, France
• Ossian's Cave, Great Britain
• Ossian's Cave, Great Britain
• Ossian's Cave, Great Britain
• Skalní město Ostaš, Czech Republic
• Bergbau- und Industriemuseum Ostbayern, Germany
• Osterhöhle, Germany
• Hüttenstollen Osterwald, Germany
• Ostrog Monastery, Montenegro
• Osugidani Gorge, Japan
• Oswaldhöhle, Germany
• Otliško Okno, Slovenia
• Otoska Jama, Slovenia
• Grube Otto, Germany
• Otto Photo Underground Photographic Gallery, Australia
• Caverna Ouro Grosso, Brazil
• Le Musée de l'Ours de Cavernes, France
• Outlaw Cave Tours, United States of America
• Outokummun Kaivosmuseo, Finland
• Oven's Caves, Canada
• Owensboro Area Museum of Science and History, United States of America
• Oweynagolman Cave, Ireland
• Grutas de Oxtotitlan, México
• Oylat Mağaraları, Turkey
• Oyo Azul, Dominican Republic
• Oyster Bar, United States of America
• Grand Central Oyster Bar, Japan
• Ozark Caverns, United States of America
• Grotta di San Michele, Italy
• Özkonak Yeralti Şehri, Turkey
• Ozluce Underground City, Turkey
• Pac Bo Cave, Vietnam
• Padah-Lin Caves, Myanmar
• Padamyar Cave, Myanmar
• Gouffre de Padirac, France
• Gruta do Padre Caio, Brazil
• Paengnyong Cave, South Korea
• Pæska Skiferbrudd, Norway
• Tham Pa Fa, Laos
• Grotta Paglicci, Italy
• Pahiyangala, Sri Lanka
• Paia Dwarfs Cave, Samoa
• Pailon del Diablo, Ecuador
• Pain de Sucre, France
• Painted Cave, United States of America
• Bois de Paiolïve, France
• Paisley Caves, United States of America
• Gruta Dos Paiva, Brazil
• Tham Pak Ou, Laos
• Palabora Copper Mine, South Africa
• Gruta del Palacio, Uruguay
• Cueva Palacio del Rey, Perú
• Palaha Cave, Niue
• Grotta Palazzese, Italy
• Mitreo di Palazzo Barberini, Italy
• Grotta di Pale, Italy
• Cueva de Palestina, Perú
• Palfauer Wasserloch, Austria
• Palmaz Vineyards, United States of America
• Palm Jumeirah Underpass, United Arab Emirates
• Palombaro Lungo, Italy
• Grotta delle Palombe, Italy
• Pálvölgyi Barlang, Hungary
• Pamukkale, Turkey
• Panagia Chrysopiliotissa Church, Cyprus
• Church of Panagia Evangelistria, Cyprus
• Panagia Spiliani, Greece
• Panagia Spiliani, Greece
• Panagia Vounarkotissa, Cyprus
• Panagria Hrysospiliotissa, Greece
• Panama Rocks Scenic Park, United States of America
• Pandavleni Caves, India
• Panhulugan Cave II, Philippines
• Panhulugan Cave I, Philippines
• Panias Spring, Israel
• Panxian Dadong, China
• Papanikolís Cave, Greece
• Fromageries Papillon, France
• Paradana Ledenika Jama, Slovenia
• Paradise Lost, Kenya
• Paradise Pansiyon, Turkey
• Parc de la Préhistoire, France
• Musée des Egouts de Paris, France
• Paris Ice Cave, United States of America
• Métro de Paris, France
• Parkhöhle Weimar, Germany
• Park City Silver Mine Tour, United States of America
• Parque de la Prehistoria, Spain
• Partnachklamm, Germany
• Bunkr Parukářka, Czech Republic
• Páskahellir, Iceland
• Minas de Passagem, Brazil
• Schneeberg Passeier, Italy
• Peshchery Past' Drakona, Russia
• Grotta di Pastena, Italy
• Pataleshwar Cave Temple, India
• Caverne Patate, Mauritius
• Abri Pataud, France
• PATH, Canada
• Reservatório da Patriarcal, Portugal
• Paulinenhöhle, Austria
• Paviland Cave, Great Britain
• Pazinska jama, Croatia
• Peacock Springs, United States of America
• Peak Cavern, Great Britain
• Peak Hill Open Cut Experience, Australia
• Peapea Cave, Samoa
• Grotte de Pech Merle, France
• Jama Pečinka, Slovenia
• Casa de Pedra, Brazil
• Pegnitzquelle, Germany
• Peik Chin Myaung Cave, Myanmar
• Jama Pekel, Slovenia
• Spilaio sta Pelekita - Sikias Spilios - Cave of Pelekita, Greece
• Pelion barlang, Hungary
• Shpella e Pëllumbasit, Albania
• Algar do Pena, Portugal
• Pendleton Underground Tours, United States of America
• Peniger Kellerberggänge, Germany
• Bufador de Peñiscola, Spain
• Penn's Cave, United States of America
• Peppersauce Cave, United States of America
• Spelaio Peramatos - Perama Cave, Greece
• A Visit of Perama Cave, Greece
• Grotte du père Noël, Belgium
• Musée d'Art et d'Archéologie du Périgord, France
• Underground Mining Museum Pernik, Bulgaria
• The Pernod Accident, France
• Grottes de Perrier, France
• Centre des Perrières, France
• Perrier-Jouët, France
• Perry's Cave, United States of America
• Schaubergwerk Pertisau, Austria
• Grotta dell'Angelo, Italy
• Peštera Pešna, Macedonia
• Peter's Cave, Cayman Islands
• La Petite Perrière, France
• La grotte des Petites-Dalles, France
• Petnicka Pecina, Serbia
• Petra Cave City, Jordan
• Spilaio Petralona - Kókkines Pétres, Greece
• Petrov Plže, Czech Republic
• Pecina kod Petrusa, Serbia
• Les casemates de la Pétrusse, Luxembourg
• Pettyjohn Cave, United States of America
• Banícka Expozícia Pezinok, Slovakia
• Pferdegöpel auf dem Rudolphschacht, Germany
• Tham Pha Chom, Thailand
• Tham Pha Hong, Thailand
• Phakant Jade Mine, Myanmar
• Tham Pha Kouang, Laos
• Tham Pha Nang Khoi, Thailand
• Tham Pha Thai, Thailand
• Tham Pha Thong, Thailand
• Tham Pha Tok, Laos
• Phattalung - Phu Khao Ok Thalu, Thailand
• Tham Phayanak, Thailand
• Philipp's Cave, Namibia
• Les souterrains de Philippeville, Belgium
• Besucherbergwerk Philippstollen Olsberg, Germany
• Phnom Chhngok Cave Temple, Cambodia
• Phnom Slap Ta'aun Caves, Cambodia
• Phnom Sorsia Cave, Cambodia
• Phoenix Mine, United States of America
• Phong Nha Cave, Vietnam
• Wat Tham Phon Sawan, Thailand
• Tham Phra Nang, Thailand
• Tham Phra Nang Nai, Thailand
• Tham Phra That, Thailand
• Tham Phra Wang Daeng, Thailand
• Tham Phraya Nakhon, Thailand
• Phugtal Gompa, India
• Cava del Piastraio, Italy
• Piccola Miniera Gl.ost srl, Italy
• Pictograph Cave, United States of America
• Pidurangala, Sri Lanka
• Rokle Piecky, Slovakia
• Chiesetta di Piedigrotta, Italy
• Cueva de la Piedra Brillante, Perú
• Jaskinia Piekło, Poland
• Pierre et Lumière, France
• Maison de la Pierre de Volvic, France
• Pießling Ursprung, Austria
• Pihlajamäki Potholes, Finland
• Cuevas del Pilar, Spain
• Cueva de la Pileta - Pileta Cave, Spain
• Pilog Mine, Thailand
• Cueva del Pindal, Spain
• Pindaya Cave, Myanmar
• Gua Pindul, Indonesia
• Pine Mountain Gold Museum, United States of America
• Pinnacles National Monument, United States of America
• Pinnacles, Malaysia
• Cueva Pintada, Spain
• La Cueva de las Pinturas, Honduras
• Pioch Farrus Mine, France
• Buco del Piombio, Italy
• Pioneer Coal Mine Tunnel, United States of America
• Piper Heidsieck, France
• La Cueva del Pirata, Spain
• Pirate's Caves, Cayman Islands
• Pirunkirkko, Finland
• Piscina Mirabilis, Italy
• Pitalkhora Caves, India
• Piula Cave Pool, Samoa
• Piusa Koopad, Estonia
• Pivka Jama and Crna Jama, Slovenia
• PJ's Underground, Australia
• Tham Pla, Thailand
• Tham Pla, Thailand
• Grotte du Placard, France
• Grottes des Planches, France
• Planinska Jama, Slovenia
• Planina Karst Polje and Seasonal Lake, Slovenia
• Platteville Mining Museum, United States of America
• Spring von Plaue, Germany
• Alaunbergwerk Ewiges Leben Plauen, Germany
• Playa Escondida, México
• Pleasley Colliery, Great Britain
• Pleven Wine Museum, Bulgaria
• Plitvička Jezera, Croatia
• Pluto's Cave, United States of America
• Plzeňské historické podzemí, Czech Republic
• Pocahontas Exhibition Coal Mine, United States of America
• Pohara Natural Bridge, New Zealand
• Abri du Poisson, France
• Polar Caves Park, United States of America
• Polchar Cave, Great Britain
• Poldark Mine, Great Britain
• Pôle Historique Minier, France
• La Grotta di Polla, Italy
• Peştera Polovragi, Romania
• Pol Roger, France
• Cueva del Pomier No 1, Dominican Republic
• Pommery, France
• Le Troglo des Pommes Tapees, France
• Ponce de Leon Springs, United States of America
• Ponderosa Saloon Mine, United States of America
• Cenote Ponderosa, México
• Pestera Ponicova, Romania
• Podul Natural de la Ponoarele, Romania
• Cova des Pont, Spain
• Pont Bon Dieu Jardin Cave, Mauritius
• Pont d'Arc, France
• Grottes Pont d'Arcole, Belgium
• Gorges du Pont du Diable, France
• Grotte de la Pontoise, France
• Le patrimoine souterrain de Pontoise, France
• Poole's Cavern, Great Britain
• Pooley Hall Colliery, Great Britain
• Popovo Polje, Bosnia and Herzegovina
• Poppenröder Quelle, Germany
• Portal 31, United States of America
• Port Alberni Hole in the Wall, Canada
• Cueva de los Portales, Cuba
• Underground Basilica of Porta Maggiore, Italy
• Porthcurno Telegraph Museum, Great Britain
• Porth yr Ogof, Great Britain
• Peștera Porțile Bihorului, Romania
• Portland Underground, United States of America
• Portuguese Cistern, Morocco
• Postojnska Jama, Slovenia
• Potosi Cooperative Mines, Bolivia
• Potpecka Pecina, Serbia
• Gouffre de Poudrey, France
• Powintaung Cave Pagodas, Myanmar
• Cueva de Pozalagua, Spain
• Mineral de Pozos, México
• La dolina Pozzatina, Italy
• Pozzo della Cava, Italy
• Prachovské skály, Czech Republic
• Salina Praid, Romania
• Praid, Romania
• Phou Prasat, Laos
• Gruta Pratinha, Brazil
• Pravčická Brána, Czech Republic
• Prax Eishöhle, Austria
• Preacher's Cave, Bahamas
• Miniera di Raibl, Italy
• Predjamska Jama, Slovenia
• Le Fort de Pré-Giroud, Switzerland
• Le Prehistorama, France
• Les Grottes de Presque, France
• Besucherbergwerk Prettau, Italy
• Cave du Prieuré, France
• Příhrazské Skály, Czech Republic
• Parco Minerario Cortabbio di Primaluna, Italy
• Princess Margaret Rose Cave, Australia
• Prison de Kara, Morocco
• Progetto Sinkhole, Italy
• Prohodna Cave, Bulgaria
• Prois de Candeleria, Spain
• Prophet Lots Cave, Jordan
• Prosek hill, Czech Republic
• Prospero's Cave, Bermuda
• Gouffre de Proumeyssac, France
• Puentedey Puente Natural, Spain
• Puente del Diablo, Argentina
• Cueva del Puerto, Spain
• Pützlöcher, Germany
• Il Pulo, Italy
• La Geoda de Pulpí, Spain
• Deep Valley of Pulsano, Italy
• Tham Pum - Tham Pla, Thailand
• Puna Tree Molds, United States of America
• Punakaiki Cavern, New Zealand
• Punarjani Guha, India
• Punker Baar, Estonia
• Punkevni jeskyne - Punkva River Cave, Czech Republic
• Dong Puong, Vietnam
• Pupu Springs, New Zealand
• Purgatory Chasm, United States of America
• Puri di monte Pugliano, Italy
• Pusté Kostely, Czech Republic
• Höhlenschoß Puxer Luegg, Austria
• Qala Qala, Bolivia
• Qilin Cave, China
• Qilin Cave Park, China
• Qixia Shan, China
• Qixing Yan, China
• Quackenschloß, Germany
• Our Lady Of Quannoubine Monastry, Lebanon
• Cueva de la Quebrada del Toro, Venezuela
• Queen Mine Tour, United States of America
• Queen City Underground, United States of America
• Quelltuffpfad Lingenau, Austria
• Grottes du Queroy, France
• Quincy Mine Hoist, United States of America
• Quinta da Regaleira, Portugal
• La Gruta del Quintero, México
• Qumran Caves, Israel
• Ghar-e-Qūrī Qal'eh, Iran
• Rabensteiner Stollen, Germany
• Raccoon Mountain Caverns, United States of America
• Underground Racquets Ltd., United States of America
• Shpella e Radacit, Serbia
• Radeka's Downunder, Australia
• Radgonske Gorice, Slovenia
• Radmer Paradeisstollen, Austria
• Jaskinia Radochowska, Poland
• Rainbow Springs, United States of America
• Jaskinia Raj, Poland
• Rajkova Pecina, Serbia
• Te Ana O Rakanui, Cook Islands
• Rákóczi barlang, Hungary
• Rakov Skocjan Nature Reserve, Slovenia
• La Cueva de la Ramblera, Spain
• Silberbergwerk Ramingstein, Austria
• La Grotte Ramioul, Belgium
• Rammelsberg, Germany
• Besucherbergwerk Ramsbeck, Germany
• Grutas de Rancho Nuevo, México
• Ranger Uranium Mine, Australia
• Ra Paulette's Caves, United States of America
• Rappenlochschlucht, Austria
• Höhlenburg Rappenstein, Switzerland
• Rasboinichja, Russia
• Cave of Rabbi Shimon bar Yochai, Israel
• Rashōmon Natural Bridges, Japan
• Rat's Nest Cave, Canada
• Rauðfeldsgjá, Iceland
• Raufarhólshellir, Iceland
• Schieferschaubergwerk Raumland, Germany
• Galleria Ravaccione, Italy
• Ravanicka Pecina, Serbia
• Ravansar Spring, Iran
• Ravenska Jama, Slovenia
• Pecina Ravnistarka, Serbia
• Rawhiti Cave, New Zealand
• Rawis Cave, Philippines
• Rebecca's Cave, Cayman Islands
• Schieferstollen Recht, Belgium
• Reckenhöhle, Germany
• Grottes de Réclère, Switzerland
• Redcliffe Caves, Great Britain
• The Grotto of the Redemption, United States of America
• Red Hill Alluvial Mine, Australia
• Redwall Cavern, United States of America
• Reed Gold Mine, United States of America
• Reefton Gold Mine Tours, New Zealand
• Refsvikhula, Norway
• Le souterrain de la Règle, France
• Grotte de Regourdou, France
• Regro S, Latvia
• Les grottes du Régulus et des Fontaines, France
• Reichhartschacht, Germany
• Cova do Rei Cintolo, Spain
• Gruta Rei do Mato, Brazil
• The Reigate Caves, Great Britain
• Grotte de la Reine Hortense, New Caledonia
• Reinhold Forster Erbstollen, Germany
• Grottes de Remouchamps, Belgium
• Santuario de Vida Silvestre Cavernas de Repechon, Bolivia
• Republic Iron Mine, United States of America
• Cuevas de la Villa Requena, Spain
• Resavska Pecina, Serbia
• Grotte di Rescia, Italy
• Miniere dei Resinelli, Italy
• Re Tarquinio, Italy
• Izviri v Retovje, Slovenia
• Retretti, Finland
• Rettenwandhöhle, Austria
• Retzer Erlebniskeller, Austria
• Festungsmuseum Reuenthal, Switzerland
• Abri Reverdit, France
• Caminito del Rey, Spain
• Reykjavik 871±2, Iceland
• Grutas Rey Marcos, Guatemala
• Ruin Aulta, Switzerland
• Eisgrotte Rhonegletscher, Switzerland
• Rhumequelle, Germany
• Ribas Underground Camping, Australia
• Jenolan Caves - Ribbon Cave, Australia
• Rickwood Caverns, United States of America
• Ridi Vihara, Sri Lanka
• Ridnaun, Italy
• Bergwerk Riedhof, Switzerland
• Riesenburg, Germany
• Dachstein-Rieseneishöhle, Austria
• Riežupes smilšu alas, Latvia
• De prehistorische vuursteenmijnen van Rijckholt - St. Geertruid, Netherlands
• Rikoriko Cave, New Zealand
• Rimarau Burial Cave, Cook Islands
• Rinquelle, Switzerland
• Carrière Souterraine de Rinval, France
• Rio Camuy Cave Park, Puerto Rico
• Nacimiento Del Rio Choy, México
• Caverna Rio dos Bugres, Brazil
• Rio Frio Caves, Belize
• Grotta di Rio Martino, Italy
• Rio Secreto, México
• Parque Minero de Riotinto, Spain
• Rischbachstollen, Germany
• Risovaca Pecina, Serbia
• Jenolan Caves - River Cave, Australia
• Riverbend Cave, Canada
• River Rise State Park, United States of America
• Roaring River Cave, Jamaica
• Robber's Cave, India
• Robber Baron Cave, United States of America
• Robbers Cave State Park, United States of America
• Robber's Cave, United States of America
• Robinson Crusoe's Cave, Chile
• Roc Cave, Philippines
• Roc-aux-Sorciers, France
• Rocha de Pena, Portugal
• Grotte du Château de La Roche, France
• Grotte Château de La Roche Courbon, France
• Grotte de Rochefort, France
• Grotte de Lorette, Belgium
• Village troglodyte Rochemenier, France
• Cave des Roches, France
• Fontaine de Roches, France
• Rock Springs, United States of America
• The Rock Gardens, Great Britain
• Rock Spring Cave, Jamaica
• Rockwoods Cave, United States of America
• Roden Crater, United States of America
• Besucherbergwerk "Markus-Röhling-Stolln", Germany
• Bergbaumuseum Röhrigschacht, Germany
• Rofflaschlucht, Switzerland
• Steinerne Rinne bei Rohrbach, Germany
• Rokan-do, Japan
• Tufière de Rolampont, France
• Grotte de Roland, France
• Rolla Experimental Mine, United States of America
• Grotte des Romains, France
• Pestera Romanesti, Romania
• Romeinse Katacomben, Netherlands
• Cueva de Romeral, Spain
• Riparo di Romito, Italy
• Romualdova Špilja, Croatia
• Ron Coleman Mining, United States of America
• Bergbaumuseum Ronneburg, Germany
• Baume de Ronze, France
• Grotte de Roque St Christophe, France
• Olavsgruva, Norway
• Miniera di Rosas, Italy
• Rose Creek Mine, United States of America
• Rosemont Copper Mine, United States of America
• Gletscherschlucht Rosenlaui, Switzerland
• Rosenmüllerhöhle, Germany
• Rosevale Mine, Great Britain
• Rosh haNikra, Israel
• Ross Cave, Australia
• Grutas do Rossio, Portugal
• Rossland Mining Museum, Canada
• Lehrbergwerk Grube Roter Bär, Germany
• Eishöhle bei Roth, Germany
• Feste Rothenberg, Germany
• Grotte de Rouffignac, France
• Rouiess Cave, Lebanon
• Round Spring, United States of America
• Round Spring Cavern, United States of America
• Domaines Rouvinez, Switzerland
• Buchan Caves - Royal Cave, Australia
• Royston Cave, Great Britain
• Banícke múzeum Rožňava, Slovakia
• Ruakuri Cave, New Zealand
• Rua Rere, Cook Islands
• Ruby Falls, United States of America
• Rudolf-Stollen, Germany
• Rudolfova štola, Czech Republic
• Tham Ruesi, Thailand
• Tham Ruesi Sombat, Thailand
• Vodopady Rufabgo, Russia
• Ruggles Mine, United States of America
• Ruijing Cave, China
• Ruinart, France
• Cueva del Rull, Spain
• Rumathi Caves, Kenya
• Mt. Rushmore Cave - Beautiful Rushmore Cave, United States of America
• Russell Cave National Monument, United States of America
• Ryongmun Taegul, North Korea
• Ryu-un shonyudo, Japan
• Ryuga-do, Japan
• Ryugashi-do, Japan
• Ryugu Doketsu Iriguchi, Japan
• Ryugujo shonyudo, Japan
• Ryusen-do, Japan
• Saarbrücker Kasematten, Germany
• La Sablière, France
• Historic Old Sacramento, United States of America
• Sacred House, Turkey
• Sacro Speco, Italy
• Saddan Cave, Myanmar
• Sado Kinzan, Japan
• Wat Tham Saeng Phet, Thailand
• Sagrada Familia Cave, Philippines
• Cenote Sagrado, México
• Sahoolan Cave, Iran
• Sai Baba Tambun Cave Temple, Malaysia
• Saiko Komori-ana, Japan
• La Grotte de Saint-Elzéar, Canada
• Grottes de Saint Antoine, France
• Grottes de Saint-Cezaire, France
• Grotte de Sainte-Baume, France
• Église Monolithe Saint-Émilion, France
• The Caves of Saint Ignacio, México
• Carrière Saint-Just, France
• Cavernicole de Saint-Léonard, Canada
• Saint Louis Eisenthür, France
• Miniere di Saint-Marcel, Italy
• Champignonnière St Maur, France
• Cluzeaux de Saint-Pardoux-de-Mareuil, France
• Grotte Saint-Remacle, Belgium
• Les Grandes Caves Saint Roch, France
• L'Abbaye troglodytique de Saint-Roman, France
• Grotte de Saint-Vit, France
• Saitobaru Burial Mounds, Japan
• Sai Yok Noi Waterfall, Thailand
• Sakishirazui-no ana, Japan
• Sala Silvergruva, Sweden
• Grutas de Salamanca, Uruguay
• Grotte de la Salamandre, France
• La Salata Necropoli Paleocristiana, Italy
• Gole del Salinello, Italy
• Salt Museum, Great Britain
• Saltpetre Cave, United States of America
• Salt Pond Cave, Bahamas
• St. Salvator, Germany
• Salzaspring, Germany
• Salzachöfen, Austria
• Salzwelten Salzburg, Austria
• Salzgrabenhöhle, Germany
• Samaria Gorge, Greece
• Samograd Špilja - Samograd Cave, Croatia
• Samograd Špilja, Croatia
• Sa Morakot, Thailand
• Grube Samson, Germany
• Cenote Samulá, México
• Samwel Cave, United States of America
• Túnel de San Adrian, Spain
• Miniera Sant'Aloisio, Italy
• Cueva de San Ambrosio, Cuba
• Sanbang Gul, South Korea
• Eremo di San Bartolomeo in Legio, Italy
• San Carlos Cave, Philippines
• Eremo di S. Colombano, Italy
• Sand Cave, United States of America
• Spilja Šandalja, Croatia
• Sandanbeki Dokutsu, Japan
• Sandbalmhöhle, Switzerland
• Sandia Cave, United States of America
• Podziemna Trasa Turystyczna w Sandomierzu, Poland
• Sand Cave, United States of America
• Cueva San Elias, Spain
• Grotta San Francesco, Italy
• Catacombe di San Gaudioso, Italy
• Catacombe di San Gennaro, Italy
• Grotta di S. Giovanni di Domusnovas, Italy
• San Giovanni d'Antro, Italy
• Sangtarashan Cave, Iran
• Cenote San Ignacio, México
• San Jaun de las Aguas, Nicaragua
• San José Silver Mine, Bolivia
• Gruta de San Jose, Spain
• San Juan de la Peña, Spain
• San Lorenzo Maggiore, Italy
• Locanda di San Martino, Italy
• Sanmenxia Yaodong, China
• Grotta di San Michele, Italy
• San Michele Arcangelo, Italy
• Grotta di S.Michele Arcangelo, Italy
• Grotta San Michele, Italy
• Grotta di San Michele, Italy
• Grotta dell'Angelo, Italy
• Grotta San Michele, Italy
• Grotta di San Michele Arcangelo, Italy
• Grotta di San Michele, Italy
• Eremo di San Michele, Italy
• San Michele delle Grotte, Italy
• San Michele, Italy
• San Michele Arcangelo, Italy
• Santuario San Michele, Italy
• Sanmin Bat Cave, China
• Cuevas de San Miquel, Cuba
• Wadi Sannur Cave, Egypt
• Gruta San Pedro, Bolivia
• San Sebastián de las Grutas, México
• Parco Archeominerario di San Silvestro, Italy
• Cova Santa, Spain
• Grotta di Santa Barbara, Italy
• Cueva Grande de Santa Catalina, Cuba
• Grotte di Santa Croce, Italy
• Museo delle Miniere Santa Fiora, Italy
• Santa Maria della Nova, Italy
• Caverna Santana, Brazil
• Museo Regional de Prehistoria y Arqueología, Spain
• Grotta di Sant'Angelo, Italy
• Sant'Angelo in Vetulis, Italy
• Sant'Angelo, Italy
• Monte Sant'Angelo, Italy
• Sant'Angelo Le Ripe, Italy
• Grotta Sant'Angelo, Italy
• SantaPark, Finland
• Santa Prisca Mithraeum, Italy
• Santa Rosa Lava Tubes, Ecuador
• Cueva de Santián, Spain
• Cueva de Santimamiñe, Spain
• La Cova de Sant Martí, Spain
• Monastery of Sant Miquel del Fai, Spain
• The Caves of the Island of Espiritu Santo, Vanuatu
• Grutas de Santo-Adriao, Portugal
• Grutas de Santo-António, Portugal
• Santo Niño Cave, Philippines
• Eremo di Sant'Onofrio, Italy
• Eremo di Sant'Onofrio al Morrone, Italy
• La Gran Caverna de Santo Tomás, Cuba
• Catacumbas do Santuário do Caraça, Brazil
• Pozzo Santullo, Italy
• Sanyou Dong, China
• Mina de São Domingos, Portugal
• Gruta São Mateus, Brazil
• Grutas de São Miguel, Brazil
• Grutas de São Vicente, Portugal
• Saratlı Kırkgöz Yeraltı Şehri, Turkey
• Troglodytes & Sarcophages, France
• Grotte Prehistorique de Sare, France
• Šarišská galéria Prešov, Slovakia
• Šarkania diera, Slovakia
• Sarnıç, Turkey
• Sa Rocca, Italy
• Saruta-do, Japan
• Cuves de Sassenage, France
• Hotel Sassi, Italy
• Sataplia Cave, Georgia
• Moravský sklípek, Czech Republic
• Terme di Saturnia, Italy
• Grotte et Canyon de Saulges, France
• Sauta Cave, United States of America
• Champignonnière du Saut-aux-Loups, France
• Slap Savice, Slovenia
• Grottes de Savonnieres, France
• Sawa-i-Lau Caves, Fiji
• Sawahlunto Coal Mine Museum, Indonesia
• Peştera Scarisoara, Romania
• Scenic Caves, Canada
• Fort du Scex, Switzerland
• Grube Schauinsland, Germany
• Schellenberger Eishöhle, Germany
• Schermerhorn Cave, United States of America
• Schertelshöhle, Germany
• Scheukofenhöhle, Austria
• Schiele Museum of Natural History, United States of America
• Schillathöhle, Germany
• Schillerhöhle, Germany
• Miniera Schilpario, Italy
• Schinderhanneshöhle, Germany
• Museum Uranbergbau Schlema, Germany
• Burgruine Schloß im Loch, Germany
• Schloß Stein, Germany
• Schmiechquelle, Germany
• Schmiecher See, Germany
• Schmittenstollen, Germany
• Schmutzlerzeche, Germany
• Schneckenloch, Austria
• Schöllenenschlucht, Switzerland
• Höhlenmuseum Schönbergalm, Austria
• Grottes Schoenfels, Luxembourg
• Scholmzeche - Aufrichtigkeit, Germany
• Schopflocher Moor, Germany
• Schuilen in Maastricht, Netherlands
• Großes Schulerloch, Germany
• Schwandorfer Felsenkeller, Germany
• Bergbaumuseum Schwarzer Crux, Germany
• Schwarzwassergraben, Switzerland
• Schwarzwasserhöhle, Austria
• Schwazer Silberbergwerk, Austria
• Grotte di Sciacca, Italy
• Grotte Scladina, Belgium
• Scotland's Secret Bunker, Great Britain
• Scott's Grotto, Great Britain
• Scottish Mining Museum Trust, Great Britain
• Caverne Sculptée, France
• Blei- und Silberbergwerk Val S-charl, Switzerland
• La grotte du Sdragonatu, France
• Sea Lion Caves, United States of America
• Masjid al-Ruqood al-Sebaa, Tunisia
• Secret Caverns, United States of America
• Kostnice v Sedlci, Czech Republic
• Sedom Cave, Israel
• Seefeldhöhle, Switzerland
• Seegrotte, Austria
• Segeberger Kalkberghöhle, Germany
• Grube Segen-Gottes, Germany
• Segen-Gottes-Erbstolln, Germany
• Seisenbergklamm, Austria
• Sekigahara dai-shonyudo, Japan
• Selçuklu Evi, Turkey
• Seldom Seen Tourist Coal Mine, United States of America
• Seljalandsfoss, Iceland
• Selman Bat Cave, United States of America
• Semuc Champey, Guatemala
• Senbutsu-do, Japan
• Seneca Caverns, United States of America
• Seneca Caverns, United States of America
• Spilaio Sphentoni, Greece
• Seokguram Grotto, South Korea
• Seongnyu Gul, South Korea
• Crystal Cave, United States of America
• Sequoyah Caverns, United States of America
• Museo del Carbone della Grande Miniera di Serbariu, Italy
• Serbian Underground Church, Australia
• Şerefiye Sarnıçı, Turkey
• Serinn, Turkey
• Coves Prehistòriques de Serinyà, Spain
• Lourdes Grotto, Aruba
• Miniera d'Oro di Sessa, Switzerland
• Setenil de las Bodegas, Spain
• Setergrotta, Norway
• Setesdal Mineral Park, Norway
• Spilia Epta Parthena, Greece
• Sextantio Albergo Diffuso Le Grotte Della Civita, Italy
• Gorges du Seyon, Switzerland
• Grotte et cascade de Seythenex, France
• Buchan Caves - Shades Of Death Cave, Australia
• Shanjuan Dong, China
• Shankargarh Caves, India
• Shapoor, Iran
• Skalen Manastir Shashkanite, Bulgaria
• Shawnee Cave Amphitheatre, United States of America
• Sheffield Mine, United States of America
• The Shelter, China
• Shelter No. 20, Japan
• Shem Va'Ever Cave, Israel
• Shenandoah Caverns, United States of America
• Shengjinkou, China
• Shennong Gong, China
• Shesh Badgir Ab Anbar, Iran
• Shigawatari-do, Japan
• Shihuadong, China
• Shi Lin, China
• Shimao Wonderland Hotel, China
• Shimoni Caves, Kenya
• Shinsen-do, Japan
• Shirataki shonyudo, Japan
• Shitodo, Japan
• Shizushi-do, Japan
• Shoryu-do, Japan
• Shoshone Ice Caves, United States of America
• Show Cave Night Gallery, United States of America
• Shrimp Hole, Bahamas
• Shuanglong Cave, China
• Shui Lian Dong, China
• Shunt, Great Britain
• Shwe Kyar Pwint Cave, Myanmar
• Shwe Oo Min Cave, Myanmar
• Sibbergroeve, Netherlands
• Sieben-Täler-Höhle, Germany
• Miniera del Siele, Italy
• Sierra Silver Mine Tour, United States of America
• Sierra Cave, Philippines
• Sigiriya, Sri Lanka
• Sigmund Thun Klamm, Austria
• Site néolithique de Sigoniac, France
• Schaubergwerk Silberberg, Switzerland
• Silbergründle, Germany
• Grube Silberhardt, Germany
• Historisches Schmucksteinbergwerk Silberschacht, Germany
• Silicka Ladnica Jaskyna, Slovakia
• Silkeborg Bunker Museum, Denmark
• Guha Siluman, Indonesia
• Silver Cave, China
• Silver King Mine Exhibit, United States of America
• Silver Springs Nature Park, United States of America
• Silver Stream Cave, China
• London Silver Vaults, Great Britain
• Simon's Cave, Malaysia
• Simpson Copper Mineshaft, Canada
• Simserhof, France
• Peştera mănăstire de la Sinca Veche, Romania
• Sinks Canyon State Park, United States of America
• Sipja Donggul, South Korea
• Šipka jeskyně, Czech Republic
• Sipun, Croatia
• Siracourt VI Storage Bunker, France
• Sirgensteinhöhle, Germany
• Sitting Bull Crystal Cave, United States of America
• Sitton's Cave, United States of America
• Skalky skřítků, Czech Republic
• Skallbergsgrottan, Sweden
• Skaren-Monsen caves, Norway
• Skarin Samograd, Croatia
• Skeleton Cave, United States of America
• Skelsky Pestera, Russia
• Skirwith Cave, Great Britain
• Skocjanske Jame, Slovenia
• Skottvångs Gruva, Sweden
• Skull Cave, Papua New Guinea
• Skull Cave, Cayman Islands
• Skyline Cavern, United States of America
• Slaughter Canyon Cave, United States of America
• Slough Caverns, Great Britain
• Sloupsko-sosuvske jeskyne, Czech Republic
• Smallin Cave, United States of America
• SMART Tunnel, Malaysia
• Grotta dello Smeraldo, Italy
• Smocza Jama, Poland
• Smoke Hole Caverns, United States of America
• Smoo Cave, Great Britain
• Smrekova Draga, Slovenia
• Smuggler Mine and Compromise Mine, United States of America
• Smuggler's Cave, Bahamas
• Snailbeach Lead Mine, Great Britain
• Snežanka Peštera, Bulgaria
• Snezna Jama, Slovenia
• Snibston Discovery Museum, Great Britain
• Snow Lake Mining Town Museum, Canada
• Snowy Mountains Hydro-electric Scheme, Australia
• Société des Caves de Roquefort, France
• Sof Omar, Ethiopia
• Grotte del Sogno, Italy
• Sohoton Natural Bridge, Philippines
• Sohoton Cave, Philippines
• Soledar Salt Mine, Ukraine
• Soligorsk Salt Mine, Belarus
• Solivar v Prešove, Slovakia
• King Solomon's Quarries, Israel
• Solotvyno, Ukraine
• Solvayovy Lomy, Czech Republic
• Solymári ördöglyuk-barlang, Hungary
• Son Bhandar Caves, India
• Erlebnisbergwerk Sondershausen, Germany
• Song-am Donggul, North Korea
• Sönghellir, Iceland
• Caverns of Sonora, United States of America
• Arizona-Sonora Desert Museum, United States of America
• Cueva de S'avenc de Son Pou, Spain
• Sontheimer Höhle, Germany
• Cueva de Sopeña, Spain
• Sophienhöhle, Germany
• Cueva del Soplao, Spain
• Sopron Bányászati Múzeum, Hungary
• Cuevas de Sorbas, Spain
• Grotte du Sorcier, France
• Sorek Cave, Israel
• Sötétkapu, Hungary
• Soudan Underground Mine, United States of America
• La Grotte de Soustelle, France
• South Crofty Mine, Great Britain
• South Glory Cave, Australia
• South Ice Cave, United States of America
• South Wales Miners' Museum, Great Britain
• Parcours Troglodytique Souzay-Champigny, France
• Grottes prehistoriques de Soyons, France
• Múzeum medi v Španej Doline, Slovakia
• Spannagelhöhle, Austria
• Spar Cave, Great Britain
• Sparozna Jama, Croatia
• Sparwood Mine Tours, Canada
• Spa Terra, United States of America
• Speakeasy 518, United States of America
• Speco di San Francesco, Italy
• Spectrum Mines, Australia
• Spectrum Sunstone Mine, United States of America
• Speedwell Cavern, Great Britain
• Speleobiološka Postaja, Slovenia
• Musée Suisse de Spéléologie, Switzerland
• Spellbound Glowworm Cave, New Zealand
• Castello di Sperlinga, Italy
• Sperrgebiet National Park, Namibia
• Spider Cave, United States of America
• Les minières de silex néolithique de Spiennes à Mons, Belgium
• Grotta della Spipola, Italy
• Spirit Mountain Cave, United States of America
• Expozícia História Baníctva na Spiši, Slovakia
• Spitzenbachklamm, Austria
• Splidfrik Cave, Molvanîa
• Spokane Bar Sapphire Mine, United States of America
• Spook Cave, United States of America
• Spouting Horn, United States of America
• Spring Cave, United States of America
• Natural Bridge Springbrook, Australia
• Spring Mill State Park, United States of America
• La Grotte de Spy, Belgium
• Squaw Cave, United States of America
• Squire Boone Caverns & Village, United States of America
• Sri Nakarin Dam, Thailand
• St Agatha's Catacombs, Malta
• Stagebarn Crystal Cave, United States of America
• Staglin Family Vineyard, United States of America
• Stahlberger Erbstollen, Germany
• Stalin's Bunker, Russia
• Standedge Tunnel, Great Britain
• St Andrew's Hall Undercroft, Great Britain
• Stanišovská jaskyňa, Slovakia
• Stanley Mine on Fisher Mountain, United States of America
• St. Anna Fundgrube, Germany
• St Anthony's Well, Great Britain
• Star Cave Hotel, Turkey
• Štola Starý Martin, Czech Republic
• Pesterna Crkva Sveti Atanasie, Macedonia
• St Blaize Cave, South Africa
• Grubenanlage "St. Briccius", Germany
• Besucherbergwerk „St.-Christoph“, Germany
• Hermitage of St. Cirijaka, Croatia
• St. Colman's Cell, Ireland
• St Cuthbert's Swallet, Great Britain
• Steam and Bat Caves, Vanuatu
• Steenkolenmijn Valkenburg, Netherlands
• Štefanova Vinska Klet, Slovenia
• La mine St Nicolas à Steinbach, France
• Heimat- und Braunkohlemuseum Steinberg am See, Germany
• Steinernes Haus, Germany
• Bergbaumuseum Steinhaus, Italy
• Historische Edelsteinminen im Steinkaulenberg, Germany
• Steinkirche, Germany
• Steinwandklamm, Austria
• Pesterna Crkva Sveti Erazmo, Macedonia
• Sterkfontein Caves, South Africa
• Sterling Hill Mining Museum, United States of America
• Stevens Twin Sinks Preserve, United States of America
• St. George Monastery, Israel
• St. Gideon Erbstollen, Germany
• St. Helena Gold Mine, South Africa
• St. Herman's Cave, Belize
• La Grotta di Stiffe, Italy
• St. John Mine, United States of America
• St. Lampertus Fundgrube, Germany
• Grottes de St-Marcel d'Ardèche, France
• St Margaret's Cave, Great Britain
• Caves St. Martin, Luxembourg
• Aziz Mercurius Yeraltı Şehri ve Kilisesi, Turkey
• Pesterna Crkva Sveti Arhangel Mihail, Macedonia
• St. Michael's Caves, Great Britain
• Stollbergs Gruvor, Sweden
• La Mine de Cuivre et le Musée Koffergrouf, Luxembourg
• Stone Cavehouse Hotel, China
• Stone Forest, China
• Stopica Pecina, Serbia
• Storbergets gruvor, Sweden
• Storrisbergsgrottorna, Sweden
• Storwartz, Norway
• The Story of Berlin, Germany
• St Paul Subterranean River National Park, Philippines
• St Paul's Catacombs, Malta
• St Paul's Grotto, Malta
• Grotto of St. Peter in Antioch, Turkey
• St Peter's Bunker Museum, Great Britain
• Grotten St. Pietersberg, Netherlands
• Strašínská jeskyne, Czech Republic
• Pesterna Crkva Sveti Stefan, Macedonia
• Eisgrotte Stubaier Gletscher, Austria
• Stump Cross Caverns, Great Britain
• Stump Cross Caverns, Great Britain
• Sturmannshöhle, Germany
• Limni Stymphalia, Greece
• Wat Tham Sua, Thailand
• Subterranean Seattle, United States of America
• SubTropolis, United States of America
• The Subway, United States of America
• Subway Cave, United States of America
• Rokle Suchá Belá, Slovakia
• Sudbury Mining Museum, Canada
• Suddah Guffa, Nepal
• Sudwala Caves, South Africa
• Sueva Dupka, Bulgaria
• Silberbergwerk Suggental, Germany
• Sugomak Pestera, Russia
• Agua Sulfurosa, Perú
• Sulitjelma Besøksgruver, Norway
• Bergbaumuseum Sulzburg, Germany
• Sumaging, Philippines
• Su Mannau Grotte, Italy
• Grotta di Su Marmuri, Italy
• Sümela Manastırı, Turkey
• Schaubergwerk Sunfixl-Höhle, Austria
• Sungai Lembing, Malaysia
• Hang Sung Sôt, Vietnam
• Schaubergwerk Sunnpau, Austria
• Sunny Jim Cave, United States of America
• The Super Pit Lookout, Australia
• Suplja Greda, Croatia
• Surtshellir-Stefánshellir system, Iceland
• Susiluola, Finland
• Las Cuevas de Susmay, Honduras
• Sutter Gold Mine, United States of America
• Tham Suwan Kuha, Thailand
• Svarthamarhola, Norway
• Ginina Mogila - Thracian Tomb of Sveshtari, Bulgaria
• Sveta Jama, Slovenia
• Isposnica Svetog Save, Serbia
• Sviatohirsk Lavra, Ukraine
• Jeskyně svatého Ivana, Czech Republic
• Swartkrans Cave, South Africa
• Sweet Surrender Crystal Mine, United States of America
• The Cave of Swimmers, Egypt
• Syanovskie Quarry, Russia
• Sybil's Cave, United States of America
• Sydvaranger Mine, Norway
• Sygun Copper Mine, Great Britain
• Syrauer Drachenhöhle, Germany
• Syri i kaltër, Albania
• Szelim-barlang, Hungary
• Szemlö-Hegy Barlang, Hungary
• Sziklakórház Múzeum, Hungary
• Szt. István Barlang, Hungary
• Tabergs gruva, Sweden
• Caves of Tabon, Philippines
• Županova Jama - Taborska Jama, Slovenia
• Tham Tab Tao, Thailand
• Täuferhöhle, Switzerland
• Bunker GO-42, Russia
• Restaurante Tagoror, Spain
• Taiji Dong, China
• Grotte Taillerie du Puy de Dôme, France
• Taio Kinzan, Japan
• Taishaku Gorge, Japan
• Taisho-do, Japan
• Champagne Taittinger, France
• Lake Taka, Greece
• Takachiho Gorge, Japan
• Take 5 Bar, Great Britain
• Anatakitaki, Cook Islands
• Takkoku no Iwaya Temple, Japan
• Tham Takobi, Thailand
• Taktsang Dzong, Bhutan
• Għar tal-Iburdan, Malta
• Talava Arches, Niue
• Taldinskij, Russia
• Las Cuevas de Talgua, Honduras
• Talijanova Buža, Croatia
• Talking Rocks Cavern, United States of America
• Tal-Mintna Catacombs, Malta
• Talofofo Cave, Guam
• Tamana Caves, Trinidad and Tobago
• Tamborine Mountain Glow Worm Caves, Australia
• Tam Coc, Vietnam
• Động Tam Cung, Vietnam
• Taminaschlucht, Switzerland
• Grotta della Tanaccia, Italy
• Goa Tanding, Indonesia
• Grotta Tanella, Italy
• Vai Tango, Cook Islands
• Cueva en Taninul, México
• Taniwha Cave, New Zealand
• Taniwha Cave, New Zealand
• Tankavaaran Kultakylässä, Finland
• Grube Tannenberg, Germany
• Tantanoola Cave, Australia
• Taor Spring, Serbia
• Taoyuandong, China
• Wat Tham Tapan, Thailand
• Tapolcai Tavasbarlang, Hungary
• Tarawera Falls, New Zealand
• Tar Tunnel, Great Britain
• Tassili n'Ajjer, Algeria
• Għar Tat-Tramuntana - Għar Tat-Tramuntana, Malta
• Tatlarin Underground City, Turkey
• Gruta do Tatu, Brazil
• Taubenlochschlucht, Switzerland
• Tauerngold-Rundwanderweg, Austria
• Cuevas de Taulabe, Honduras
• Tawi Ateer, Oman
• Taxco Silver Mines, México
• La Cueva de los Tayos, Ecuador
• Te Anaroa Cave, New Zealand
• Te Anaroa Cave, New Zealand
• Te Anau Glowworm Caves, New Zealand
• Teeq, Oman
• Tekniikan Museo, Finland
• Tekniska Museet, Sweden
• Tellure, France
• Temiya Cave, Japan
• Temnata dupka, Bulgaria
• La Mine Témoin, France
• Miniera del Temperino, Italy
• The Templars Tunnel, Israel
• Temple Mine, Great Britain
• Jenolan Caves - Temple of Baal Cave, Australia
• L'Osteria del Tempo Perso, Italy
• Temppeliaukion kirkko, Finland
• Gua Tempurung, Malaysia
• Ten Bay Cave, Bahamas
• Tenglong Dong, China
• Te'omim Cave, Israel
• Teorumata Cave, New Zealand
• Teotihuacán, México
• Ana Te Pahu, Chile
• Tepe-Kermen, Russia
• Ana Te Pora, Chile
• Gua Terang Bulan, Malaysia
• Sima Terciopelo, Costa Rica
• Mitreo delle Terme del Mitra, Italy
• Terra Mystica, Austria
• Gua Terus, Malaysia
• Cueva del Tesoro, Spain
• Les Gorges Mystérieuses de Tête Noire, Switzerland
• Tetri Cave, Georgia
• Tettyei Mésztufa-barlang, Hungary
• Teufelshöhle, Germany
• Teufelsschlucht, Switzerland
• Teufelshöhle, Germany
• Besuchsbergwerk Teufelsgrund, Germany
• Teufelsschlucht, Germany
• Grotte de Teyjat, France
• Grottes de Thaïs, France
• þakgilshellir, Iceland
• Thames Gold Field, New Zealand
• Tham Thanh Cave, Vietnam
• Tham Than Lot, Thailand
• Tharon Cave, India
• The Bunker, Great Britain
• The Cave Bar, Cyprus
• The Caves Hotel, Jamaica
• The Caves, Bahamas
• The Crypt, Great Britain
• Theopetra Cave, Greece
• Gruben- und Feldbahnmuseum Zeche Theresia, Germany
• Therissou Gorge, Greece
• Hot Springs State Park, United States of America
• Thetford Mines, Canada
• Hang Thien Cung, Vietnam
• Thien Duong, Vietnam
• Les Hautes-Mynes du Thillot, France
• Thingbæk Kalkminer, Denmark