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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