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• 10,000 Year Clock, United States of America
• 108 Tomb Caves, Japan
• Zwölf-Apostelkeller, Austria
• Underground Project 131, China
• Third Man Tour, Austria
• 816 Military Nuclear Plant, China
• Abadía del Sacromonte, Spain
• Absalom’s Tomb, Israel
• Abteimuseum Echternach, Luxembourg
• Abu Simbel, Egypt
• Caves Ackerman, France
• Cuevas de Acusa Seca, Spain
• Adalaj Stepwell, India
• Adi Kadi Vav, India
• Adjimushkay Quarries, Russia
• Admiralty House Park, Bermuda
• Saint Barbara Cave Church, Cyprus
• Agia Paraskevi, Greece
• Iepa Moni Agios Gerasimos, Greece
• Cave Church of Saint Nicholas, Greece
• Agios Spyridon, Cyprus
• Ağırnas Yeraltı Şehri, Turkey
• A GoGo Valkenburg, Netherlands
• Agrasen ki Baoli, India
• Aihole, India
• Air Raid Shelters of Mellieħa, Malta
• Ajanta Caves, India
• Akköy Evleri, Turkey
• Aladzha Monastery, Bulgaria
• Folkklubs Ala Pagrabs, Latvia
• Cuevas Pedro Antonio de Alarcón, Spain
• Albarracín-Cella Roman Aqueduct, Spain
• Aleksandrovo Thracian Tomb, Bulgaria
• Alexander Nevsky Cathedral Underground Crypt, Bulgaria
• Al Fayah Park, United Arab Emirates
• Alfina Hotel, Turkey
• Aliança Underground Museum, Portugal
• Aljibe Andalusí, Spain
• Centro de Interpretación Hábitat Troglodita Almagruz, Spain
• La Grotte de Glace Alpe d’Huez, France
• The Alpha Omega Cave, South Africa
• Alter Elbtunnel, Germany
• Altinocak Restaurant, Turkey
• Aluvihare Rock Temple, Sri Lanka
• Alux Restaurant & Lounge, México
• Amer Stepwell, India
• Ami Chenin, France
• Amir Chakhmaq Complex, Iran
• Amos Rex, Finland
• Anaktos Santorini Cave Houses, Greece
• Anatolian Houses, Turkey
• Anchor Church, Great Britain
• Andersgrotta, Norway
• Bīr al-Anezīya, Israel
• The Angel Microbrewery Cave, Great Britain
• Necropoli di Anghelu Ruju, Italy
• Anlage Mitte, Poland
• Church of the Annunciation, Israel
• Antoniyevi Pechery, Ukraine
• Pavilon Anthropos, Czech Republic
• Casa Grotta Antica Matera, Italy
• Cueva de Anzo, Spain
• Grenier d’Aoujgal, Morocco
• Aquarium Grotto, Egypt
• Projekt Arado, Poland
• Cave Archangel Michael Panormitis, Greece
• Cluzeaux d’Argentine, France
• Arizona Mining and Mineral Museum, United States of America
• Arles Cryptoportiques du Forum, France
• Historische Kelders Arnhem, Netherlands
• Cave Village Artenara, Spain
• Art Space Winery, Greece
• Artwinery, Ukraine
• Aruküla Caves, Estonia
• ’Ashabi Alkahf, Jordan
• Astana Underground Museum, China
• L’Astore Masseria, Italy
• Asura Cave, Nepal
• Ataman Hotel, Turkey
• Underground Atlanta, United States of America
• Atlantic Cave, United Arab Emirates
• Atlantikwall, France
• Atomic Museum, United States of America
• KGB Atominis Bunkeris, Lithuania
• Atomkeller, Germany
• The Treasury of Atreus, Greece
• La Carrière d’Aubigny, France
• Auerbachs Keller, Germany
• Auracher Löchl, Austria
• Aurangabad Caves, India
• Aux Vieux Logis, France
• Aydıntepe Yeraltı Şehri, Turkey
• Ayias Solomonis Cave Church and Catacombs, Cyprus
• Ayia Thekla Cave Church, Cyprus
• Ayioi Saranta Cave Church, Cyprus
• Ayios Sozomenos Cave Church, Cyprus
• Aynalı Mağara, Turkey
• Azize Thecla Kutsal Alanı, Turkey
• Badami Cave Temple, India
• Bag End, Middle-Earth
• Bagh Caves, India
• Naval Museum Complex Balaklava, Russia
• Teqehja Ballëm Sulltani, Albania
• Grottenburg Balm, Switzerland
• Bandelier, United States of America
• Bandiagara Escarpment, Mali
• Baneshwar Cave Temple, India
• Barabar Caves, India
• Bari Imam Cave, Pakistan
• Barry troglodyte village, France
• Basarbovo Cave Monastery, Bulgaria
• Basiliani Hotel, Italy
• Bat Cave, Canada
• Battistero Neoniano, Italy
• Battle of Britain Control Room, Great Britain
• Ddieri di Baulì, Italy
• Bava Pyara Caves, India
• Crypte du Bayaà, France
• Grotta dei Beati Paoli, Italy
• Ipogeo de Beaumont Bellacicco, Italy
• Tunnel von Bech, Luxembourg
• Beckham Creek Cave Haven, United States of America
• Bedsa Caves, India
• Beer Quarry Caves, Great Britain
• Beihai Tunnel, China
• Beishiku Si, China
• Beit She’arim National Park, Israel
• Belgrade Underground Tour, Serbia
• Pasaje Belgrano, Argentina
• Bell Caves, Israel
• Bell Inn Caves, Great Britain
• Tomb of Benei Hezir, Israel
• Benshoof Cistern Museum, Israel
• Benten Cave, Japan
• Bergkristall, Austria
• Beringer Vineyards, United States of America
• Berliner Unterwelten, Germany
• Caves Bernard-Massard, Luxembourg
• Beşikli Kaya Mezarları, Turkey
• B-Werk Besseringen, Germany
• Eiskeller der Brauerei Beuing, Germany
• Parc archéologique de Beynac, France
• Bezeklik Thousand Buddha Caves, China
• Bhaja Caves, India
• Bhalil Cave Dwellings, Morocco
• Bhandara Buddhist Caves, India
• Bhartrihari Caves, India
• Binbirdirek Sarnıçı, Turkey
• Binġemma, Malta
• Bird’s Botanicals, United States of America
• Birresborner Eishöhlen, Germany
• Citadelle de Bitche, France
• Manastira Blagoveštenje, Serbia
• Blair Street Underground Vaults, Great Britain
• Jeskyně Blanických rytířů, Czech Republic
• Gruta da Boa Sorte, Brazil
• Covetes dels Moros, Spain
• Les casemates du Bock, Luxembourg
• Petit Ouvrage du Bois de Bousse A24, France
• Bollinger, France
• Il Borgo Ritrovato, Italy
• Pętla Boryszyńska, Poland
• Bosc de Fades Bar, Spain
• Bottini, Italy
• Bounce Below, Great Britain
• Les Caves Bouvet-Ladubay, France
• Les Boves, France
• Parcours troglodytique de l’Abbaye de Brantôme, France
• Amphitheater Breechkaul, Luxembourg
• Château de Brézé, France
• Brighton’s Victorian Sewer, Great Britain
• Morski Tunel Brijesta, Croatia
• Aqueduc Souterrain de Briord, France
• Brněnská kostnice, Czech Republic
• Bronson Caverns, United States of America
• Brotherhood Winery, United States of America
• Bruce’s Cave, Great Britain
• Brünig Indoor Schiess-Sport-Zentrum, Switzerland
• Brûly-de-Pesche 1940, Belgium
• Campement préhistorique de Bruniquel, France
• Brunson Instrument Company, United States of America
• Bunker B-S 8 Hřbitov, Slovakia
• Höhlenburg Buchfart, Germany
• Buco di Viso, Italy
• Budai Váralagút, Hungary
• Bude Tunnel, Great Britain
• Spiaggia Bue Marino, Italy
• Buffalo Bayou Park Cistern, United States of America
• Bulla Regia, Tunisia
• Bundesbank-Bunker, Germany
• Atombunker der Bundesregierung, Germany
• Bunk´Art 1, Albania
• Bunk´Art 2, Albania
• Bunker Mooseum, Italy
• Westwallmuseum Bunker 20, Germany
• Bunkermuseum Emden, Germany
• Bunkermuseum Hamburg, Germany
• Bunkermuseum Rennsteig, Germany
• Grotta del Buontalenti, Italy
• Burlington, Great Britain
• Covolo di Butistone, Italy
• Cabinet War Rooms, Great Britain
• Café in the Crypt, Great Britain
• Manoir de la Caillère, France
• Calcata Cave Houses, Italy
• Caldecotte Project, Great Britain
• Grottes de Calès, France
• Eremo di Calomini, Italy
• Città sotterranea di Camerano, Italy
• Museo Termas Romanas de Campo Valdés, Spain
• Canard Duchene, France
• Grotta del Cane, Italy
• Oriu di i Canni, France
• Los Caños del Peral, Spain
• Museo del Capitolo di San Lorenzo, Italy
• Cappadocia Cave Suites, Turkey
• Cappadocia Palace, Turkey
• Cappadocia Cave Resort & Spa, Turkey
• Catacombe dei Cappuccini, Italy
• Chiesa del Cappuccino Vecchio, Italy
• El Búnker del Capricho, Spain
• La Cueva Caprichosa, Spain
• Antiche Grotte del Caricatore, Italy
• Estación de Carpetana, Spain
• Carrières des Capucins, France
• Casa Cava, Italy
• Casa Cisterna Sotterranea, Italy
• La Casa di Lucio, Italy
• Storica Casa Grotta di Vico Solitario, Italy
• Casa Grotta del Casalnuovo, Italy
• Casino Keller, Austria
• Souterrain médiéval du Castela, France
• Grotte di Sant’Anna Castelfidardo, Italy
• Castello Sicano, Italy
• Catacomb Church, Australia
• Catacombe Roma - The Catacombs of Rome, Italy
• The Catacombs of Paris, France
• Cathedrale d’Images, France
• Les Cathédrales de la Saulaie, France
• Museo Cava Acque, Italy
• Parco archeologico di Cava d´Ispica, Italy
• Cavallo d´Ispica, Italy
• Cavea Arcari, Italy
• Cave Escape Nottingham, Great Britain
• Cave Hill, Ireland
• Caveman Bar-BQ & Steak House, United States of America
• Cave Museum Santorini, Greece
• Caveoso Hotel, Italy
• Cave des Producteurs de Montlouis, France
• Cavern Club, Great Britain
• Cave Santorini Spa, Greece
• Roc de Cazelle, France
• Cehennemağzi Mağarası, Turkey
• Bunker Tour Cervia, Italy
• Estación de Chamberí, Spain
• Musée Suisse de la Spéléologie, Switzerland
• Fort d’artillerie de Champex-Lac, Switzerland
• Le Musée du Champignon, France
• Chand Baori, India
• Changyu Dongtian - Changyu Stone Cave, China
• The Channel Island Military Museum, Great Britain
• Channel Tunnel, Great Britain
• El Chapandáz, Spain
• Underground Chattanooga, United States of America
• Grotte Chauvet 2 Ardèche, France
• Chelter-Koba, Russia
• Museum of Speleology and Bulgarian Karst, Bulgaria
• Oriu de Chera, France
• Chersonesos Cave Chruch, Russia
• Chislehurst Caves, Great Britain
• Grotta di Chitaridd, Italy
• Museo civico "La Città Sotterranea", Italy
• Cholula - Quetzalcoatl Tunnels, México
• Chrám kamene, Czech Republic
• Chreli Abano, Georgia
• Christiansborg Slot, Denmark
• ChufutKale, Russia
• La Chumbera, Spain
• Paddock - Churchill’s Secret Bunker, Great Britain
• Churchill, Malta
• Cincinnati Museum Center, United States of America
• Fort du Cindey, Switzerland
• Circ romà, Spain
• Museo Paseo de la Cisterna, Argentina
• Cisternerne, Denmark
• Cisterne Romane Amelia, Italy
• Cisternone, Italy
• Cisternone Romano, Italy
• Citadelle de Namur, Belgium
• La Cité du Volcan, France
• City Museum, United States of America
• Cunicoli di Claudio, Italy
• Clifton Cliff Jail, United States of America
• Cloaca Maxima, Italy
• Le Clos des Roches, France
• Grotta di Cocceio, Italy
• Schloß Colditz Escape Tunnels, Germany
• Covetes del Colomer, Spain
• Colossal Cave, United States of America
• Colosseum, Italy
• Grotte Tufacee Comunali, Italy
• Museo della Civiltà Contadina, Italy
• Cook Museum, United States of America
• Copán, Honduras
• Mănăstirea Corbii de Piatră, Romania
• Grottes du Cornadore, France
• Coudenberg Palace, Belgium
• Gabriel Coulet, France
• Couvre Porte, Malta
• Chapel of Our Lady of the Crag, Great Britain
• Maison des Pierreux de Crazannes, France
• Sewer Canals of Crepzep, Molvanîa
• Festungsmuseum Crestawald, Switzerland
• Cricova Galeriile Subterane, Moldova
• Cripta duomo Città di Castello, Italy
• Grotta dei Cristalli, Switzerland
• Manastir Crna Reka, Serbia
• Crocodile Harry, Australia
• Crowborough Caves, Great Britain
• Cruachan Power Station, Great Britain
• Knights Halls, Israel
• Crypte archéologique de l’île de la Cité, France
• The Crystal Caves, Australia
• Crystal Shrine Grotto, United States of America
• Cuatro Puertas, Spain
• Củ Chi Tunnels, Vietnam
• Çukurören Yeraltı Şehri, Turkey
• Culver Hole, Great Britain
• Cuma - Antro della Sibilla, Italy
• Curraghmore House, Ireland
• Cave of the Cyclops, Cyprus
• Untertageverlagerung Dachs 1, Germany
• Daciyan, China
• Dada Harir Stepwell, India
• Dahan Stronghold, China
• Fort de Dailly, Switzerland
• Heidenkapelle, France
• Dalton Gang Museum and Escape Tunnel, United States of America
• Damanhur Temple, Italy
• Dambulla, Sri Lanka
• La Mina de Daroca, Spain
• Darwin WWII Oil Storage Tunnels, Australia
• David Gareja, Georgia
• David Hasselhoff Museum, Germany
• Daxiangshan Grottoes, China
• Dazu Grottoes, China
• D Dupleks, Latvia
• De Castellane, France
• Dedeli Konak, Turkey
• Deinhard Kellermuseum, Germany
• Délirium Café, Belgium
• Demeter’s Crypt, Russia
• Derinkuyu Yeraltı Şehri, Turkey
• Derlon Hotel Museum Cellar, Netherlands
• Desert Cave Hotel, Australia
• Deutsches Bergbau Museum, Germany
• Deutsches Bunkermuseum, Germany
• Deutsches Museum, Germany
• Dewstow Gardens and Grottoes, Great Britain
• Dhank Caves, India
• Diamante Falls, Costa Rica
• Hotel Diar el Barbar, Tunisia
• Diefenbunker, Canada
• Digger’s Dream Underground Home, Australia
• Dimbulagala, Sri Lanka
• Di Shui Dong, China
• Divine Cave Experience, Greece
• Divnogorsky Uspensky Cave-Monastery, Russia
• Přečerpávací vodní elektrárna Dlouhé Stráně, Czech Republic
• Dolní Vĕstonice, Czech Republic
• Gurra Antike e Domgjonit, Albania
• Dom Im Berg, Austria
• Muches de Domqueur, France
• DOMunder, Netherlands
• Dorking Caves, Great Britain
• Eisstollen Dornburg, Germany
• Fort de Douaumont, France
• Dougout Ranch, United States of America
• Dowa Rajamaha Viharaya, Sri Lanka
• Down to Erth, Australia
• Caverne du Dragon, France
• Grotta della Dragonara, Italy
• Dragon Hall Undercroft, Great Britain
• Drakelow Tunnels, Great Britain
• Muzey Drevnego Cheloveka, Russia
• Les Drois Glands, Luxembourg
• Dudley Canal Tunnels, Great Britain
• Museumsbunker Düppenweiler, Germany
• Duivelsgrot, Netherlands
• Dunaskin Open Air Museum, Great Britain
• Dungeshwari, India
• Dunhuang Mogao Caves, China
• Dunsthöhle, Germany
• Dupont Underground, United States of America
• Tomb of the Eagles, Great Britain
• Kasematte Edling Süd, France
• Egkleistra, Cyprus
• Eglise monolithe Saint Jean, France
• Egloffsteiner Felsenkeller, Germany
• Musée des Égouts, Belgium
• Bunker Eichenthal, Germany
• Eispalast Jungfraujoch, Switzerland
• Dachstein Eispalast, Austria
• Eispavillon Mittelallalin, Switzerland
• Ekotechnické Museum, Czech Republic
• El Depósito, The Philippines
• Electric Mountain Visitor Centre, Great Britain
• Elephanta Caves, India
• Bodega El Fabulista, Spain
• Elkep Evi Cave Houses, Turkey
• Jaunpils Elles Kalns, Latvia
• Ellinwood Underground Tunnels, United States of America
• Ellora Caves, India
• El Meson de la Cava, Dominican Republic
• El Zanjón de Granados, Argentina
• Muzeul de Speologie "Emil Racoviţă", Romania
• Le Blockhaus d’Éperlecques, France
• Eshab-i Kehf - Grotto of Seven Sleepers, Turkey
• Tham Erawan, Thailand
• Erbendorfer Felsenkeller, Germany
• Bunker WH-767 “Erlkönig”, Germany
• Esbelli Evi, Turkey
• Casemate Esch, France
• Eski-Kermen, Russia
• Santuario Virgen de la Esperanza, Spain
• Balma d’Esplugues, Spain
• Essex Secret Bunker, Great Britain
• Esterlin, France
• Museo Nazionale Etrusco, Italy
• Tunnel of Eupalinus, Greece
• Eureka Springs Underground, United States of America
• Euston Lost Tunnels, Great Britain
• Evakueringshulen, Norway
• Exeter’s Underground Passages, Great Britain
• Expo Cave Karst, Slovenia
• Eysturoyartunnilin, Faroe Islands
• Museo Faggiano, Italy
• Bunker Falkenhagen, Germany
• Faris Caves, United States of America
• Farm8, South Korea
• Le Faux Saulnier, France
• Fayes Underground Home, Australia
• Federal Reserve Bank of New York Gold Vault, United States of America
• Österreichisches Felsbildermuseum, Austria
• Nürnberger Felsengänge, Germany
• Cisterne Romane Fermo, Italy
• Fertőrákosi Barlangszínház, Hungary
• Lycian Tombs at Fethiye, Turkey
• St Fillan’s Cave, Great Britain
• Domaine Filliatreau, France
• Caves of Filopappou Hill, Greece
• Cova de les Finestres, Spain
• Florida Museum of Natural History, United States of America
• Fluweelengrot, Netherlands
• Grottes de Folx-Les-Caves, Belgium
• José Maria da Fonseca Wine Cellars, Portugal
• Cisterna della Fontana del Calamo, Italy
• Cimitero delle Fontanelle, Italy
• Abbaye Royale de Fontevraud, France
• Forchheimer Keller, Germany
• Criptoportico Forense, Italy
• Forestiere Underground Gardens, United States of America
• Formula Center, Finland
• La Fornace di Barbablù, Italy
• Fort Amherst Tunnel Tour, Great Britain
• Fort Bonifacio Tunnel, The Philippines
• Fort Casso, France
• Forteiland, Netherlands
• Fort Hommet Gun Casemate, Great Britain
• Parco Archaeologico Forza, Italy
• La Fosse de Forges, France
• Ouvrage du Four-à-Chaux, France
• Höhlenburg Fracstein, Switzerland
• Franciscan Monastery, United States of America
• Tomba Francois, Italy
• Frank Aston Underground Museum, Australia
• Franklin Court Underground Museum, United States of America
• Frantoi Ipogei di Grottaglie, Italy
• Frantoio Ipogeo Granafei, Italy
• Frantoio Ipogeo Caffa, Italy
• Frantoio Ipogeo Sternatia, Italy
• Höhlenmuseum Frasdorf, Germany
• Frihedsmuseet, Denmark
• Fromosa Boulevard Station, China
• Festung Fürigen, Switzerland
• Grüner Bräu Keller, Germany
• Führerbunker, Germany
• Gadara, Jordan
• Goa Gajah, Indonesia
• Venta El Gallo, Spain
• Gamaoreum Japanese Cavern Site, South Korea
• Gamirasu Otel, Turkey
• Gavi Gangadhareswara, India
• Gankutsu Hotel, Japan
• Atombunker Garzau, Germany
• La Grotte de Gaulier, France
• Gaziemir Yer Altı Şehri, Turkey
• Geghard, Armenia
• Gemeentegrot, Netherlands
• Les Caves de la Genevraie, France
• Genovevahöhle bei Bell, Germany
• Geraer Höhler, Germany
• Jersey War Tunnels, Great Britain
• German Naval Signals Headquarters, Great Britain
• German Underground Hospital, Great Britain
• La Grotta Dei Germogli, Italy
• Grotto of Gethsemane, Israel
• Geulhemmergroeve, Netherlands
• Ghorawadi Caves, India
• Cuevas del Gigante, Spain
• Gilmerton Cove, Great Britain
• Gimhae Wine Cave, South Korea
• Gjøvik Olympic Mountain Hall, Norway
• Gonawatta Ancient Caves, Sri Lanka
• Gorge Underground, United States of America
• Manastir Gornjak, Serbia
• Goto Mall, South Korea
• Gotthard Basistunnel, Switzerland
• Vallée troglodytique des Goupillières, France
• Graselhöhle, Austria
• Champagne Alfred Gratien, France
• Maisons troglodytes du Graufthal, France
• Gravina Sotterranea, Italy
• Great Bend Railroad Tunnel, United States of America
• Great Siege Tunnels, Great Britain
• Underground Great Wall, China
• Greenbrier Bunker, United States of America
• Greenwich Foot Tunnel, Great Britain
• Caves Louis de Grenelle, France
• Felslabor Grimsel, Switzerland
• Kraftwerk Grimsel 2, Switzerland
• Grotesquery, Czech Republic
• Maria SS. Addolorata a Grottasanta, Italy
• Grottenaquarium, Netherlands
• Grottenbahn am Pöstlingberg, Austria
• Höhlenburg Grottenstein, Switzerland
• Grotto Tavern, Malta
• The Grove Park Inn, United States of America
• Guacara Taina, Dominican Republic
• Catacumbas de Guadalajara, México
• Guadix Cave Houses, Spain
• Grosser Atomschutz-Bunker in Güdingen, Germany
• Guhantara, India
• Guildhall Medieval Crypt, Great Britain
• Hilfskrankenhaus Gunzenhausen, Germany
• Gurugem Phuk, China
• Guyaju Caves, China
• Habis Caves, Lebanon
• Gros Ouvrage A19 Hackenberg, France
• Hack Green Secret Nuclear Bunker, Great Britain
• Bunker Hagen, Germany
• Haikong Cave, China
• Mithrasgrotte, Germany
• Halliggye Fogou, Great Britain
• Ħal Saflieni Hypogeum, Malta
• Hamatoura Monastery, Lebanon
• Hand and Heart, Great Britain
• Hanibe Caves, Japan
• Hantongshan Shenxian Dong, China
• Hard Rock Vault, Great Britain
• Haritun Cave, Israel
• Bunker Harnekop, Germany
• Hartness House, United States of America
• Musée de l’Abri de Hatten, France
• Haunted Cave, United States of America
• Hausertorstollen, Germany
• Les Hautes Roches, France
• Hawkstone Park, Great Britain
• Monastery of Our Lady of Hawqa, Lebanon
• Hazan Caves, Israel
• Festung Heldsberg, Switzerland
• Helensburgh Glowworm Tunnel, Australia
• Zivilschutzbunker Helgoland, Germany
• Restaurant l’Hélianthe, France
• Caves of Hella, Iceland
• Hellfire Corner, Great Britain
• Hellnahellir, Iceland
• Helme Koopad, Estonia
• Cueva de Hércules, Spain
• Herts Young Mariners Base, Great Britain
• Herzgruft, Austria
• Hezekiah’s Tunnel, Israel
• Hideout, Ukraine
• Hilehvar Buried Village, Iran
• Himmelsbergstollen, Germany
• Morski tunel Hitlerove oči, Croatia
• Hobbiton, New Zealand
• Atlantikwall-Museum Hoek van Holland, Netherlands
• Hohenfels-Essinger Eishöhlen, Germany
• Hohllay, Luxembourg
• Hole N" The Rock, United States of America
• Holkovsky Monastery, Russia
• Hollombuwa Sthreepura Cave Temple, Sri Lanka
• Hollow Mountain, United States of America
• Schloßberghöhlen, Germany
• Honi HaMe’agel, Israel
• Honzrather Keller, Germany
• Hotel Jalta Bunker Museum, Czech Republic
• The Secret Rooms of Hotel Jama, Slovenia
• Hotel Sassi Di Matera Diffuso, Italy
• La Hougue Bie, Great Britain
• House on Fire, United States of America
• Downtown Houston Tunnel System, United States of America
• Hrad Houska, Czech Republic
• Huashan Quarries, China
• Huayan Temple, China
• Hubertuskapelle, Germany
• Huligemmana Kolla, India
• Hulimev Cave Temple, India
• Humphrey Kynaston’s Cave, Great Britain
• Dělostřelecká Tvrz Hůrka, Czech Republic
• Husitské muzeum, Czech Republic
• Huto and Kamarband Cave, Iran
• Ice Age Glacial Exhibit, United States of America
• Instituto Geológico y Minero Español, Spain
• Għar il-Kbir, Malta
• il-Barri Restaurant, Malta
• Le Cisterne ed il Palombaro dell’Hotel Il Belvedere, Italy
• Bunker Ilbenstadt, Germany
• İnceğiz Mağaraları, Turkey
• Museum of Independence, Bangladesh
• Indian Cave, Antigua & Barbuda
• Indianapolis City Market Catacombs, United States of America
• 3rd Infiltration Tunnel, South Korea
• 4th Infiltration Tunnel, South Korea
• 2nd Infiltration Tunnel, South Korea
• Injun Joe’s Cave, United States of America
• Innocent Railway Tunnel, Great Britain
• Institutul de Speologie "Emil Racoviţă", Romania
• Interstate Caves, United States of America
• Isteiner Klotz, Germany
• Itäkeskuksen Uimahalli, Finland
• Ivanovo Rock Churches, Bulgaria
• Iwamuro Kannon, Japan
• Iwaya Kannon Cave, Japan
• Iwayayama Cave, Japan
• Izumizaki Cave Tomb, Japan
• Podzemna crkva i katakombe Jajce, Bosnia and Herzegovina
• Podziemia Jarosławskie, Poland
• Grottes troglodytes de la Jaubernie, France
• Goa Jepang Klungkung, Indonesia
• Ye Olde Trip to Jerusalem, Great Britain
• La Cueva del tío Jesús, Spain
• Jezuïetenberg, Netherlands
• Jihlavské podzemí, Czech Republic
• Jindeng Temple, China
• Grottes de Jonas, France
• Jordan Creek Underground Tours, United States of America
• Jorf Khettaras, Morocco
• Josefov Podzemi, Czech Republic
• Josef Stalin’s Underground Printing House Museum, Georgia
• Les Journées de la Rose, France
• Jugendstiltoilette, Austria
• Internationales Fledermaus-Museum Julianenhof, Germany
• Jungang Underground Shopping Center, South Korea
• Jurnet’s Bar, Great Britain
• Cave Church Kadjenica, Serbia
• Former Japanese Navy Underground Headquarters, Japan
• Kaiserliche Schatzkammer, Austria
• Unterirdische Gänge Kaiserslautern, Germany
• Feste Kaiser Wilhelm II, France
• Ausweichsitz Nordrhein-Westfalen, Germany
• Monastery Kaloritsa, Greece
• Emmi Cheese Cave Kaltbach, Switzerland
• Cizinecký vstup do kanalizace, Czech Republic
• Kandovan, Iran
• Kanheri Caves, India
• Kanmon Kaikyo Tunnel, Japan
• Grotten Van Kanne, Belgium
• Kannon Dokutsu, Japan
• Kantakuzen’s Catacomb, Ukraine
• Bunker am Kap Arkona, Germany
• Erdstallmuseum am Kapellenberg Althöflein, Austria
• Kapilikaya Rock Tomb, Turkey
• Kapucínská krypta, Czech Republic
• Kapuzinergruft, Austria
• Karaftu Cave, Iran
• Karavanserai Bakery, Georgia
• Karla Caves, India
• Karl-May-Höhle, Germany
• Brasserie Kazematten, Belgium
• Katflaap Catacombs, Molvanîa
• Tombs of the Kings, Cyprus
• Katpatuka Cave Hotel, Turkey
• Kaunos Kral Mezarları, Turkey
• Kayadem Cave Hotel, Turkey
• Kaymaklý Yeraltı Şehri, Turkey
• Kazanluk Tomb, Bulgaria
• Brouwerij De Kazematten, Belgium
• Kelebek Hotel, Turkey
• Cave of Kelpius, United States of America
• Kelvedon Hatch Secret Nuclear Bunker, Great Britain
• Command Bunker Kemmel, Belgium
• Kessler Kellerführungen, Germany
• Khambhalida Buddhist Caves, India
• Khandagiri Cave, India
• Caves of Khandepar, India
• Khao Nam Khang Historical Tunnel, Thailand
• Khapra Kodiya Caves, India
• Khareba Winery, Georgia
• Caves of Khnatsakh, Armenia
• Kh’ndzoresk, Armenia
• Wat Khuha Phimuk, Thailand
• Muuseum Kiek in de Kök, Estonia
• Kiev Pechersk Lavra, Ukraine
• Widerstandsnest 67 HL, Netherlands
• Air Defense Operations Center Kindsbach, Germany
• Kinver Edge Rock Houses, Great Britain
• Kipina Monastery, Greece
• Kish Underground City, Iran
• Kizil Caves, China
• Bergbaumuseum Klagenfurt, Austria
• Klatovské katakomby, Czech Republic
• Klausenhöhle, Germany
• Kleine Berlin, Italy
• Gletschergrotte Klein Matterhorn, Switzerland
• Podziemna Trasa Turystyczna 1000-Lecia Panstwa Polskiego w Klodzku, Poland
• Twierdza Klodzka, Poland
• Klusfelsen, Germany
• Kőbányai pincerendszer, Hungary
• Zivilschutzbunker Köln-Kalk, Germany
• Kokopelli’s Cave, United States of America
• Kom es-Shouqafa, Egypt
• Kondhane Buddhist Caves, India
• Museum "Rock" Korosten, Ukraine
• Kottukal Cave Temple, India
• Koutsogiannopoulos Wine Museum, Greece
• Wat Tham Krabok, Thailand
• U Krále Brabantského, Czech Republic
• Vinárna U Královny Elišky, Czech Republic
• Rovi pod starim Kranjem, Slovenia
• Kronborg Slot, Denmark
• Höhlenburg Kropfenstein, Switzerland
• Potkop Krušica, Croatia
• Kryt 10 - Z, Czech Republic
• Kryt Denis, Czech Republic
• Kuda Mandad Caves, India
• Eshab-ı Kehf Kulliye, Turkey
• Kulturbunker Barbarastollen, Germany
• Kunming Natural History Museum of Zoology, China
• Historischer Kunstbunker, Germany
• Kupferberg Museum, Germany
• Kuragala Cave Temple, Sri Lanka
• Kurjey Lhakhang, Bhutan
• Kyat Khayon Cave Monastery, Myanmar
• Budavári Labirinthus, Hungary
• Labirinto di Roma, Italy
• Labirinto Casilino, Italy
• Labirinto di Porsenna, Italy
• Labyrinth pod Zelným trhem, Czech Republic
• Caves and Labyrinths, Ukraine
• Restaurant La Cave, France
• La Caverna, Honduras
• La Caverne, Netherlands
• La Claustra Hotel, Switzerland
• La Coupole, France
• Bunker Ladeburg, Germany
• Lærdalstunnelen, Norway
• Grotte del Lago Grande, Italy
• LagOmar, Spain
• La Grotte de Glace La Grave La Meije, France
• La Gruta, México
• Lalibela, Ethiopia
• Grotta Lamalunga, Italy
• Grottes de Lamberta, Switzerland
• Lamgao Buddhist Caves, India
• Batteri Landsort, Sweden
• Höhlenwohnungen in Langenstein, Germany
• Langjökull Glacier Grotto, Iceland
• Lanson, France
• Les Lapidiales, France
• Fort Troglodytique de La Roque Gageac, France
• Lascaris War Rooms, Malta
• Las Cuevas, Spain
• Lastiver Cave, Armenia
• Latomie, Italy
• Launois Père & Fils, France
• Laurent-Perrier, France
• La Valette Underground Military Museum, Great Britain
• Gua Lebar, Indonesia
• Le Caveau, France
• Lee Ice House, Great Britain
• Lenagala Rajamaha Vihara, Sri Lanka
• Lenyadri Caves, India
• Le Prince Noir, France
• La Grotte de Glace Les Arcs, France
• La Grotte de Glace Les 2 Alpes, France
• Musée National de Préhistoire, France
• Les Maisons de Cappadoce, Turkey
• Les Terrasses d’Uchisar, Turkey
• Levon’s Divine Underground, Armenia
• Musée de la Libération de Paris, France
• Liboriusklause, Germany
• Lice Ashâb-ı Kehf Mağarası, Turkey
• Carrières de la Lie, France
• Lima Catacombs, Perú
• Limmern Pumped Storage Plant, Switzerland
• Podzemie pod vežami, Slovakia
• Lisboa Roman Galleries, Portugal
• Liss Ard, Ireland
• Zámecké sklepení Litomyšl, Czech Republic
• Fort de Litroz, Switzerland
• Llewelyn’s Cave, Great Britain
• Local Cave House, Turkey
• Höhlenburg Loch, Germany
• Burg Loch, Austria
• Lockport Cave Raceway Tour, United States of America
• Lötschberg-Basistunnel, Switzerland
• Löwengrube, Germany
• London Underground, Great Britain
• Longmen Grottoes, China
• Longyou Caves, China
• Lost Caves, Great Britain
• Grotta di Lourdes del Beato Claudio, Italy
• LowLine, United States of America
• Lubang Jepang, Indonesia
• Lublova Torturak, Molvanîa
• Lucca City Walls Basement, Italy
• Museo di Speleologia Luigi Fantini, Italy
• Museo ng Libingan sa Ilalim ng Lupa, The Philippines
• Lupercale, Italy
• Lutetia´s Sewer System, France
• Luzit Caves, Israel
• Maastricht Kazematten, Netherlands
• Maastunnel, Netherlands
• Museu Vulcanoespeleológico "Machado Fagundes", Portugal
• Ma’arat HaMachpelah, Israel
• Santuario della Madonna della Grotta di Bombile, Italy
• Santuario della Madonna della Grotta, Italy
• Madonna della Corona, Italy
• Madonna delle Virtù, Italy
• Chiesa Rupestre della Madonna della Croce, Italy
• Chiesa della Madonna del Parto, Italy
• Maeshowe, Great Britain
• Magdalena-Einsiedelei, Switzerland
• Magická Jeskyně, Czech Republic
• Festungsmuseum Magletsch, Switzerland
• Magnanerie de Bourré, France
• Farmacia del Mago Greguro, Italy
• Mahabalipuram Caves, India
• Mahakali Caves, India
• Mahendravadi Cave Temple, India
• Maiji Shan Caves, China
• Mailly Grand Cru, France
• Maison Forte, France
• Maison Owl, Japan
• Shpella e Maligradit, Albania
• Malinta Tunnel, The Philippines
• Malovaný sklep, Czech Republic
• Victorian Music Hall Malt Cross, Great Britain
• Monastery Cave Restaurant, North Macedonia
• Manazan Mağaraları, Turkey
• Manchester Cave, United States of America
• Mandarado Yagura Caves, Japan
• Mangapwani Slave Cave, Tanzania
• MangupKale, Russia
• Manitou Cliff Dwellings, United States of America
• Mar Antonios Kozhaya, Lebanon
• Deir Mar Antonios, Egypt
• Maratika Gufa, Nepal
• Domaine de Marc Brédif, France
• Musée Mémorial de la Ligne Maginot du Rhin, France
• Cuevas de la Mare de Deu, Spain
• Maresha, Israel
• Margate Caves, Great Britain
• Margate Grotto, Great Britain
• Baños de Doña María de Padilla, Spain
• Maria im Stein, Germany
• Zambra María la Canastera, Spain
• Ristorante Grotta Marinara, Italy
• Markt Höhler, Germany
• Monastery of Mar Lishaa, Lebanon
• Domačija Marof, Slovenia
• Maropeng, South Africa
• Mar Qayuma Monastery, Iraq
• Les Caves de Marson, France
• G.H. Martel et C°, France
• Mary King’s Close, Great Britain
• Masitise Cave House Museum, Lesotho
• Rifugio Antiaereo Martana, Italy
• Maison des Pierreux de Massangis, France
• Matala Caves, Greece
• Materasum Ipogeo, Italy
• The Cave Homes of Matmâta, Tunisia
• Matsushiro Underground Imperial Headquarters, Japan
• Mauerwald, Poland
• Mazi Underground Settlement, Turkey
• McGregor’s Cave, Great Britain
• Gruta de la Virgen de la Medalla Milagrosa, Argentina
• Medieval Louvre Underground, France
• Höhler von Meerane, Germany
• Louisville Mega Cavern, United States of America
• Mega Spiléo - The Great Cave, Greece
• Meidan Bazar, Georgia
• Melek-Chesmensky Kurgan, Russia
• Mělnické Podzemí, Czech Republic
• Cuevas de Menga y Viera, Spain
• Mercier, France
• Grotte de la Mer de Glace, France
• Mesa Verde NP, United States of America
• Balma del Messere, Italy
• Die Meyerschen Stollen, Switzerland
• Ouvrage du Michelsberg, France
• Miedzyrzecki Rejon Umocniony, Poland
• Mikurodo Cave, Japan
• Mileştii Mici, Moldova
• Milk Grotto Chapel, Israel
• Millennium Underground Museum, Hungary
• Millie Mine Bat Cave, United States of America
• Catacombs of Milos, Greece
• Milton House, United States of America
• La Forteresse de Mimoyecques, France
• Sklep pod Novou Radnicí, Czech Republic
• Mine Howe, Great Britain
• Museum of Mineralogy, Petrology and Mineral Resources, Bulgaria
• Mineralienhöhler, Germany
• Miners’ Dugouts, Australia
• Mines & Meadows ATV Riding Resort, United States of America
• Minnesota Museum Of Mining, United States of America
• Cave of Miracles, United Arab Emirates
• Mithraeum, Italy
• Mithraeum San Clemente, Italy
• Mittelbau Dora - Mittelwerk Dora, Germany
• Missouri Botanical Garden, United States of America
• Modlivý důl, Czech Republic
• Moët & Chandon, France
• La Cave Aux Moines, France
• Muzeum vltavínů, Czech Republic
• Puig des Molins Nekropolis, Spain
• Museum of Old and New Art, Australia
• Monastery Cave Hotel, Turkey
• Les Caves Monmousseau, France
• Monsanto, Portugal
• Galleria Montale, San Marino
• Montepulciano La Città Sotterranea, Italy
• Monte Sant’Angelo sul Gargano, Italy
• Montezuma Castle National Monument, United States of America
• La Ville Souterraine, Canada
• Réservoir de Montsouris, France
• Cisternas Romanas de Monturque, Spain
• Matera Olive Oil Museum, Italy
• Temple of the Moon, Perú
• Tunnels of Moose Jaw, Canada
• Moqui Sand Caves, United States of America
• Moravská Banka Vín, Czech Republic
• Cave Bar More, Croatia
• Tunnel du Mortier, France
• Moscow Metro, Russia
• Motouleng Caves, South Africa
• Mukyudou, Japan
• G.H. Mumm, France
• Muqattam Mountain Cave Cathedral, Egypt
• Muro Iwa Cave, Japan
• Musée du Vin, France
• Museo Arqueológico, Spain
• Museo Canario, Spain
• Museu de Minas Ouro Prêto, Brazil
• Museu de Temàtica Espeleològica, Spain
• Slovenské múzeum ochrany prírody a jaskyniarstva, Slovakia
• Waitomo Caves Discovery Centre, New Zealand
• Museum Hotel, Turkey
• Museo della Scultura Contemporanea Matera, Italy
• Mustang Caves, Nepal
• Cistern of Ancient Mycenae, Greece
• Rock-cut Tombs in Myra, Turkey
• Mysterium Fidei, Malta
• Nagarjuna Caves, India
• Nakilbent Sarnıçı, Turkey
• Mănăstirea Nămăiești, Romania
• Tham Nam Bang, Thailand
• Nanshiku Temple, China
• La Cité Souterraine de Naours, France
• Museo del Sottosuolo Napoletano, Italy
• Napoli Sotterranea, Italy
• Horreum de Narbonne, France
• Narni Sotterranea, Italy
• Narva Victoria Bastioni kasematid, Estonia
• Nashoba Brook Stone Chamber, United States of America
• National Justice Museum, Great Britain
• Národi Technické Muzeum, Czech Republic
• Grotto of the Nativity, Israel
• Natural History Museum Rijeka, Croatia
• Museum Festung Nauders, Austria
• Navghan Kuvo, India
• Molvanîan National Emergency Bunker, Molvanîa
• Necromanteion of Ephyra, Greece
• Neischlhöhle, Germany
• Nemo 33, Belgium
• Neronian Cryptoporticus, Italy
• Netherton Tunnel Branch Canal, Great Britain
• Casemate de Neunhoffen, France
• Nevşehir Yeraltı Şehri, Turkey
• Newgrange, Ireland
• Newnes Glow Worm Tunnel, Australia
• Northern Ireland´s Secret Bunker, Ireland
• Cave of Nicanor, Israel
• La Crypte Archéologique de Nice, France
• Fortress of Niha, Lebanon
• Die historische Grotte in den Herrenhäuser Gärten, Germany
• Nilometer, Egypt
• Bunkermuseum RAW Nippes, Germany
• Pigeonnier de la Niverdière, France
• Noirmont Command Bunker, Great Britain
• Atlantikwall Museum Noordwijk, Netherlands
• North Head Tunnels, New Zealand
• Norwich Guildhall Crypt, Great Britain
• Farkaskői Alkotótelep, Hungary
• Notranjski muzej Postojna, Slovenia
• Notre Dame du Scex, Switzerland
• City of Caves, Great Britain
• Nottingham Castle Cave Tours, Great Britain
• Museum of Nottingham Life, Great Britain
• Null Stern Hotel, Switzerland
• Underground City of Nushabad, Iran
• Holy Cave Nymphaeum, Greece
• Feste Obergentringen, France
• Röhrenbunker am Oberlandesgericht, Germany
• Ekspozycja Przyrodnicza Ojców, Poland
• Ojo Guareña, Spain
• Ojukwu Bunker, Nigeria
• Old City Hall Station, United States of America
• Onigashima Cave, Japan
• Podziemia Opatowskie w Opatowie, Poland
• Oppenheimer Kellerlabyrinth, Germany
• L’Orbiere, France
• Museo del Oro Bogotá, Colombia
• Museo del Oro Precolombino, Costa Rica
• Orvieto, Italy
• Grotte di Osimo, Italy
• Osowka Complex, Poland
• Ossian’s Cave, Great Britain
• Ostrog Monastery, Montenegro
• Temple in the Tomb of Ostrusha, Bulgaria
• Castello di Otranto, Italy
• Otto Photo Underground Photographic Gallery, Australia
• Le Musée de l’Ours de Cavernes, France
• Owensboro Area Museum of Science and History, United States of America
• Oyster Bar, United States of America
• Grand Central Oyster Bar, Japan
• Özkonak Yeralti Şehri, Turkey
• Özlüce Yeraltı Şehri, Turkey
• Estación de Pacífico, Spain
• Grotta Paglicci, Italy
• Painshill Park’s Crystal Grotto, Great Britain
• Podzemni grad Paklenice, Croatia
• Mitreo di Palazzo Barberini, Italy
• Paleo Stone Age Gunungkidul, Indonesia
• Cementiri de Palma, Spain
• Palmaz Vineyards, United States of America
• Parco Urbano dei Palmenti, Italy
• Palm Jumeirah Underpass, United Arab Emirates
• Palombaro Lungo, Italy
• Panagia Chrysopiliotissa Church, Cyprus
• Church of Panagia Evangelistria, Cyprus
• Panagia Spiliani, Greece
• Panagia Vounarkotissa, Cyprus
• Panagria Hrysospiliotissa, Greece
• Pandava Caves, India
• Pandavleni Caves, India
• Pangju Cave, China
• Fromageries Papillon, France
• Paradise Pansiyon, Turkey
• Parc de la Préhistoire, France
• Cova des Pardals, Spain
• Musée des Egouts de Paris, France
• Métro de Paris, France
• Potkop Parja, Croatia
• Parkhöhle Weimar, Germany
• Park Tunnel, Great Britain
• Parque de la Prehistoria, Spain
• Museum of Partisan Glory, Ukraine
• Bunkr Parukářka, Czech Republic
• Parvati Buddhist Cave, India
• Pataleshwar Cave Temple, India
• PATH, Canada
• Reservatório da Patriarcal, Portugal
• Tham Paya Nakarat, Thailand
• Cripta del Peccato Originale, Italy
• Pskov-Pechory Monastery, Russia
• Pivnice Pegas Jakubská, Czech Republic
• Pendleton Underground Tours, United States of America
• Peniger Kellerberggänge, Germany
• Peralassery Subrahmanya Temple Pond, India
• Pergola Hotel Cave Bar, Malta
• Musée d’Art et d’Archéologie du Périgord, France
• Grottes de Perrier, France
• Centre des Perrières, France
• Perrier-Jouët, France
• Minimetrò Perugia, Italy
• Petersfriedhof Katakomben, Austria
• La Petite Perrière, France
• Petra Cave City, Jordan
• Petrov Plže, Czech Republic
• Petrovaradin Fortress Underground, Serbia
• Les casemates de la Pétrusse, Luxembourg
• Tham Pha Thai, Thailand
• Les souterrains de Philippeville, Belgium
• Phugtal Gompa, India
• Ipogeo di Piazza Duomo, Italy
• Pidurangala, Sri Lanka
• Chiesetta di Piedigrotta, Italy
• Pierre et Lumière, France
• Maison de la Pierre de Volvic, France
• Grotte di Pilato, Italy
• Pilikuththuwa Rajamaha Viharaya, Sri Lanka
• Piper Heidsieck, France
• Piscina Mirabilis, Italy
• Pitalkhora Caves, India
• Piusa Koopad, Estonia
• Piyamit Tunnel, Thailand
• PJ’s Underground, Australia
• Pleven Wine Museum, Bulgaria
• Regional Natural History Museum, Bulgaria
• Plzeňské historické podzemí, Czech Republic
• Museum of Strategic Rocket Forces, Ukraine
• Muzeum Zimnej Wojny Podborsko 3001, Poland
• Eremo di Poggio Conte, Italy
• Poli Cave House, Greece
• Pommery, France
• Le Troglo des Pommes Tapees, France
• Thrakian Tomb "Hollow Mound" Pomorie, Bulgaria
• Le patrimoine souterrain de Pontoise, France
• Tombs of the Kings of Pontus, Turkey
• Erdstall Populorum, Austria
• Underground Basilica of Porta Maggiore, Italy
• Porthcurno Telegraph Museum, Great Britain
• Portland Underground, United States of America
• Portuguese Cistern, Morocco
• Powintaung Cave Pagodas, Myanmar
• Pozzo della Cava, Italy
• Le Fort de Pré-Giroud, Switzerland
• Le Prehistorama, France
• Préhistorama Châtelperron, France
• Cave du Prieuré, France
• Prison de Kara, Morocco
• Prophet Lots Cave, Jordan
• Tomb of the Prophets, Israel
• Prosek hill, Czech Republic
• El Puig de la Balma, Spain
• Punker Baar, Estonia
• Kellergasse Purbach, Austria
• Pusté Kostely, Czech Republic
• Puye Cliff Dwellings, United States of America
• Qanat Gesuitico Alto, Italy
• Qanat Gesuitico Basso, Italy
• Qanat di Palermo, Italy
• Qasar Masafi Restaurant, United Arab Emirates
• Qingtian Hall, China
• Our Lady Of Quannoubine Monastry, Lebanon
• Queen Adelaides Chapel, Great Britain
• Queen City Underground, United States of America
• Queensway Mersey Tunnel, Great Britain
• Quinta da Regaleira, Portugal
• Rabban Hormizd Monastery, Iraq
• La Raccolta delle Acque, Italy
• Underground Racquets Ltd., United States of America
• Radeka’s Downunder, Australia
• Radgonske Gorice, Slovenia
• La Cueva de la Ramblera, Spain
• Ramsgate Tunnels, Great Britain
• Rani Ki Vav, India
• Ra Paulette’s Caves, United States of America
• Höhlenburg Rappenstein, Switzerland
• Erdstall Ratgöbluckn, Austria
• Rattlesnake Saloon, United States of America
• Caves de Rauzan, France
• Redcliffe Caves, Great Britain
• The Grotto of the Redemption, United States of America
• Koldkrigsmuseet REGAN Vest, Denmark
• Burg und Festung Regenstein, Germany
• Le souterrain de la Règle, France
• Regro S, Latvia
• Les grottes du Régulus et des Fontaines, France
• Reigando Cave, Japan
• The Reigate Caves, Great Britain
• Reims Cryptoportique, France
• Reise Cave, Iran
• Cuevas de la Villa Requena, Spain
• Re Tarquinio, Italy
• Retretti, Finland
• Retzer Erlebniskeller, Austria
• Festungsmuseum Reuenthal, Switzerland
• Reykjavik 871±2, Iceland
• Eisgrotte Rhonegletscher, Switzerland
• Rhydymwyn Valley Works, Great Britain
• Ribas Underground Camping, Australia
• Casemate Rieffel, France
• Cave of St. Ivan Rilski, Bulgaria
• Cave of St. Ivan Rilski near Skrino, Bulgaria
• Carrière Souterraine de Rinval, France
• Centro de Interpretación de Risco Caído, Spain
• Robber’s Cave, United States of America
• Robert-Bourassa Generating Station, Canada
• Roc-aux-Sorciers, France
• Rocca Paolina, Italy
• Village troglodyte Rochemenier, France
• Cave des Roches, France
• Cueva de la Rocio, Spain
• Roden Crater, United States of America
• Cuevas Romanas, Spain
• Romeinse Katacomben, Netherlands
• Cueva de Romeral, Spain
• Grutas do Rossio, Portugal
• Eishöhle bei Roth, Germany
• Feste Rothenberg, Germany
• Domaines Rouvinez, Switzerland
• Royal Pavilion & Garden, Great Britain
• Royston Cave, Great Britain
• Rudolfova štola, Czech Republic
• Tham Ruesi Sombat, Thailand
• Ruinart, France
• Rynek Podziemny, Poland
• Saarbrücker Kasematten, Germany
• La Sablière, France
• Historic Old Sacramento, United States of America
• Sacred House, Turkey
• Museo Cuevas del Sacromonte, Spain
• Wat Tham Saeng Phet, Thailand
• Sai Baba Tambun Cave Temple, Malaysia
• Grottes de Saint Antoine, France
• Ermitage Saint Antoine De Galamus, France
• Église troglodytique Saint-Christophe, France
• Ouvrage Sainte-Agnès, France
• Église Monolithe Saint-Émilion, France
• Greek Orthodox Church of Saint Gabriel, Israel
• Carrière Saint-Just, France
• Champignonnière St Maur, France
• Grottes de Saint-Maurin, France
• Cluzeaux de Saint-Pardoux-de-Mareuil, France
• Cave of Saint Paul the Apostle, Greece
• 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
• La Salata Necropoli Paleocristiana, Italy
• Ye Olde Salutation Inn, Great Britain
• St. Salvator, Germany
• Samangala Ancient Cave Temple, Sri Lanka
• Restaurant Cova Sa Nacra, Spain
• Eremo di San Cataldo, Italy
• L’Eremo di S. Corrado Fuori le Mura, Italy
• Podziemna Trasa Turystyczna w Sandomierzu, Poland
• Chiesa di San Filippo Apostolo, Italy
• Grotta San Francesco, Italy
• Cistern of the Convent of San Francesco, San Marino
• Chiesa di San Gaetano alle Grotte, Italy
• Catacombe di San Gaudioso, Italy
• Catacombe di San Gennaro, Italy
• Catacombe di San Giovanni, Italy
• Sangtarashan Cave, Iran
• Cueva de San Ignacio, Spain
• Túnel de la Iglesia San Ignacio de Loyola, Argentina
• San Jaun de las Aguas, Nicaragua
• San Juan de la Peña, Spain
• Eremo di San Leonardo, Italy
• San Lorenzo Maggiore, Italy
• L-Għar ta´San Martin, Malta
• Locanda di San Martino, Italy
• Sanmenxia Yaodong, China
• Chiesa Rupestre di S. Nicola, Italy
• Chiesa Rupestre di San Nicolò Inferiore, Italy
• Bodegas Carlos San Pedro Perez de Viñaspre, Spain
• San Pietro Barisano, Italy
• San Pietro Barisano Residence e Ristorante, Italy
• Cisterna de San Roque, Spain
• Chiese Rupestri di Santa Barbara, Italy
• Catacomba di Santa Caterina d’Alessandria, Italy
• Santa Caterina del Sasso, Italy
• Mazmorras de la Posada de la Santa Hermandad, Spain
• Chiesa di Santa Lucia alle Malve, Italy
• Catacomba di Santa Lucia, Italy
• Santa Maria de Idris, Italy
• Catacomba di Santa Mustiola, Italy
• Museo Regional de Prehistoria y Arqueología, Spain
• Necropoli di Sant’Andrea Priu, Italy
• SantaPark, Finland
• Santa Prisca Mithraeum, Italy
• Santuario di Santa Rosalia, Italy
• Cava de Sant Blai, Spain
• Santica, Japan
• Monastery of Sant Miquel del Fai, Spain
• SantoCaves, Greece
• Cueva del Santo Hermano Pedro, Spain
• Catacumbas do Santuário do Caraça, Brazil
• Necropoli di Santu Pedru, Italy
• Serapeum of Saqqara, Egypt
• Sarajevski Tunel Spasa, Bosnia and Herzegovina
• Saratlı Kırkgöz Yeraltı Şehri, Turkey
• Troglodytes & Sarcophages, France
• Šarišská galéria Prešov, Slovakia
• Shpella e Sari Salltikut, Albania
• Sarnıç, Turkey
• Sa Rocca, Italy
• Hotel Sassi, Italy
• Moravský sklípek, Czech Republic
• Champignonnière du Saut-aux-Loups, France
• Fort du Scex, Switzerland
• Schauplatz Eiserner Vorhang, Austria
• Schere Complex, Malta
• Atlantikwall Museum Scheveningen, Netherlands
• Schiele Museum of Natural History, United States of America
• Schloß Stein, Germany
• Höhlenmuseum Schönbergalm, Austria
• Fort de Schoenenbourg, France
• Grottes Schoenfels, Luxembourg
• Schuilen in Maastricht, Netherlands
• Schwandorfer Felsenkeller, Germany
• Scotland’s Secret Bunker, Great Britain
• Scott’s Grotto, Great Britain
• Caverne Sculptée, France
• Masjid al-Ruqood al-Sebaa, Tunisia
• Secrets of Underground Odessa, Ukraine
• Kostnice v Sedlci, Czech Republic
• Grotta di Seiano, Italy
• Selçuklu Evi, Turkey
• Seokguram Grotto, South Korea
• Seppun Tunnel, Japan
• Serbian Underground Church, Australia
• Serdika Metro Station, Bulgaria
• Şerefiye Sarnıçı, Turkey
• Serinn, Turkey
• Lourdes Grotto, Aruba
• Setenil de las Bodegas, Spain
• Tomb of Seuthes III, Bulgaria
• Seven Springs Tunnel, Greece
• Sextantio Albergo Diffuso Le Grotte Della Civita, Italy
• Shah Allah Ditta Caves, Pakistan
• Skalen Manastir Shashkanite, Bulgaria
• The Shelter, China
• Shelter No. 20, Japan
• Shem Va’Ever Cave, Israel
• Shengjinkou, China
• Shepan Island Quarry, China
• Shesh Badgir Ab Anbar, Iran
• Shimao Wonderland Hotel, China
• Show Cave Night Gallery, United States of America
• Shui Lian Dong, China
• Shunt, Great Britain
• Sibbergroeve, Netherlands
• The Cave Šibenik, Croatia
• Grotta della Sibilla di Marsala, Italy
• Silkeborg Bunker Museum, Denmark
• Silver Stream Cave, China
• London Silver Vaults, Great Britain
• Simserhof, France
• Peştera mănăstire de la Sinca Veche, Romania
• Siracourt VI Storage Bunker, France
• Sivasa Gökçetoprak Yeraltı Şehri, Turkey
• Ski Dubai Ice Cave, United Arab Emirates
• Skt. Laurentius, Denmark
• SMART Tunnel, Malaysia
• Pivnice U Šneka, Czech Republic
• Snowy Mountains Hydro-electric Scheme, Australia
• Société des Caves de Roquefort, France
• M/S Museet for Søfart, Denmark
• King Solomon’s Quarries, Israel
• Musée Somme 1916, France
• Son Bhandar Caves, India
• Song Unsa Temple, South Korea
• Arizona-Sonora Desert Museum, United States of America
• Bunker Soratte, Italy
• Sötétkapu, Hungary
• Parcours Troglodytique Souzay-Champigny, France
• Spa Terra, United States of America
• Speakeasy 518, United States of America
• Castello di Sperlinga, Italy
• Festungsmuseum Sperre Trin, Switzerland
• Spilia Caves Santorini, Greece
• Stadshuskällaren, Sweden
• St Agatha’s Catacombs, Malta
• Staglin Family Vineyard, United States of America
• Stalin’s Bunker, Russia
• Standedge Tunnel, Great Britain
• St Andrew’s Hall Undercroft, Great Britain
• Peștera Sfântului Antonie de la Iezer, Romania
• Star Cave Hotel, Turkey
• Hermitage of St. Cirijaka, Croatia
• Štefanova Vinska Klet, Slovenia
• Stollenanlagen am Stephansberg, Germany
• Koldkrigsmuseum Stevnsfort, Denmark
• St. George Monastery, Israel
• Peștera Sfântului Grigorie Decapolitul, Romania
• St. Joseph’s Church, Israel
• St Margaret’s Cave, Great Britain
• Caves St. Martin, Luxembourg
• Aziz Mercurius Yeraltı Şehri ve Kilisesi, Turkey
• Stone Cavehouse Hotel, China
• The Story of Berlin, Germany
• St Paul’s Catacombs, Malta
• St Paul’s Grotto, Malta
• Hermitage of St. Peter of Koriša, Serbia
• St Peter’s Bunker Museum, Great Britain
• Grotten St. Pietersberg, Netherlands
• Stradetska Pestera, Ukraine
• Středověká Krčma, Czech Republic
• Archaeological Level of St. Sophia Basilica, Bulgaria
• Eisgrotte Stubaier Gletscher, Austria
• Submarine Tunnel, Montenegro
• Subterranean Seattle, United States of America
• SubTropolis, United States of America
• Sümela Manastırı, Turkey
• Tham Suwan Kuha, Thailand
• Špilja-crkva sv. Ante, Croatia
• Ginina Mogila - Thracian Tomb of Sveshtari, Bulgaria
• Isposnica Svetog Save, Serbia
• Sviatohirsk Lavra, Ukraine
• Syanovskie Quarry, Russia
• Sybil’s Cave, United States of America
• Symposion Cultural Center, Greece
• Sziklakórház Múzeum, Hungary
• Ta’ Bistra Catacombs, Malta
• Bunker GO-42, Russia
• Restaurante Tagoror, Spain
• Grotte Taillerie du Puy de Dôme, France
• Champagne Taittinger, France
• Take 5 Bar, Great Britain
• Takkoku no Iwaya Temple, Japan
• Taktsang Dzong, Bhutan
• Għar tal-Iburdan, Malta
• Talijanova Buža, Croatia
• Tal-Mintna Catacombs, Malta
• Tamagawa Daishi, Japan
• Tamborine Mountain Glow Worm Caves, Australia
• Taniwha Cave, New Zealand
• Wat Tham Tapan, Thailand
• Mar Taqla, Syria
• Taranto Sotterranea, Italy
• Cueva los Tarantos, Spain
• Tašmajdanska pećina, Serbia
• Tatlarin Yeraltı Şehri, Turkey
• Għar Tat-Tramuntana - North Cave, Malta
• Taya Caves, Japan
• Cave Dwellings of Tegh, Armenia
• Templar Tunnel, Israel
• El Templo del Flamenco, Spain
• L’Osteria del Tempo Perso, Italy
• Temppeliaukion kirkko, Finland
• Monastery of the Temptation, Israel
• Tepe-Kermen, Russia
• Las Termas Romanas, Spain
• Mitreo delle Terme del Mitra, Italy
• Terra Vinea, France
• The Bunker, Great Britain
• The Cave, Indonesia
• The Cave Bar, Cyprus
• The Caves Hotel, Jamaica
• The Crypt, Great Britain
• The Underground Speakeasy and Distillery, United States of America
• Le Thot, France
• Thunder Head Underground Falls, United States of America
• Tianti Grottoes, China
• Tiergartentunnel, Germany
• Tierradentro Rock Tombs, Colombia
• Tihanyi barátlakások, Hungary
• Ti Law Ka Guru Cave, Myanmar
• Tilly Whim Caves, Great Britain
• Casas Cueva del Tio Tobas, Spain
• Acropolis of Ancient Tiryns, Greece
• Tiscali, Italy
• Titan Missile Museum, United States of America
• Gletschergrotte Titlis, Switzerland
• Tito’s Bunker, Bosnia and Herzegovina
• Titus Tüneli, Turkey
• Todi Sotterranea, Italy
• Historická Pivnica Tokaj & Co S.R.O., Slovakia
• Shutoken Gaikaku Hosuiro, Japan
• Subterráneos de Toledo, Spain
• Tonkararin, Japan
• Toorji Ka Jhalra Bavdi, India
• Topolandia, Costa Rica
• Törley Pezsgőmanufaktúra, Hungary
• The Grottoes of Toyuk, China
• Grotta delle Trabacche, Italy
• Traben-Trarbacher Unterwelt, Germany
• New York Transit Museum, United States of America
• Cave of Treasures, Israel
• Treasures in the Walls Museum, Israel
• Tre Buchi, Switzerland
• Tregiffian Burial Chamber, Great Britain
• Brunnenstollen Trippstadt, Germany
• Triq Rumana, Malta
• Troglododo, France
• Troll Cave, New Zealand
• Village Troglodyte de Trôo, France
• Trough Creek, United States of America
• Tsar’s Mound, Russia
• Tulsa Cave House, United States of America
• Tumbling Creek Cave, United States of America
• Tünel, Turkey
• Túneles de Buenos Aires, Argentina
• Tunnel 88, China
• Stockholms Tunnelbana, Sweden
• Préhisto Parc, France
• Tuyuq Khojam Mazar, China
• Tyne Tunnel, Great Britain
• Uçhisar Kalesi, Turkey
• Udabno, Georgia
• Udaigiri Caves, India
• Überlinger Stollen, Germany
• Ulmener Maar-Stollen, Germany
• Museum Ulm, Germany
• Umeda, Japan
• Undavalli Caves, India
• Beijing’s Underground City, China
• Underground Church, Australia
• Mount Isa Underground Hospital and Museum, Australia
• Underground Potteries, Australia
• The Underground Motel, Australia
• Underground House, United States of America
• Underground Prisoners Museum, Israel
• Unicorn Brewery Cellars, Australia
• Centre for International Light Art, Germany
• Bunkerstollen Unterland, Germany
• Uperkot Caves, India
• Upliszikhe, Georgia
• Upton Chamber, United States of America
• Urbex, Ukraine
• Urgeschichtliches Museum in Blaubeuren, Germany
• Ürgüp Evi Cave Hotel, Turkey
• Urnerloch, Switzerland
• Museum Ladin Ursus ladinicus, Italy
• Ushibushi dōkutsu, Japan
• Uspensky Cave Monastery, Russia
• Utatlan Cave, Guatemala
• Conjunto de Cuevas de Utiel, Spain
• Fort d’Uxegney, France
• Valletta Tunnels, Malta
• La Grotte de Glace Valloire, France
• Museo de la Valltorta, Spain
• Valtice sklípek, Czech Republic
• Vanis Kvabebi, Georgia
• Vardzia, Georgia
• Vashistha Gufa, India
• Sacre Grotte Vaticane, Italy
• The Vault, Netherlands
• Fort de Vaux, France
• Venetsanos Winery, Greece
• Catacombe ebraiche di Venosa, Italy
• Vereina Tunnel, Switzerland
• VersuchStollen Hagerbach, Switzerland
• Vettuvan Koil Temple, India
• Veuve Clicquot, France
• Vezir Cave Suites, Turkey
• Criptoportico Romano Vicenza, Italy
• Victoria Tunnel, Great Britain
• Vicus Caprarius, Italy
• Vieng Xai Cave City, Laos
• Unknown Underground Vienna, Austria
• Carriere de Vignemont, France
• Demeure de la Vignole, France
• Villa Fliedner, Germany
• Villa Torlonia, Italy
• Villecroze Caves, France
• Chateau Villemaurine, France
• Fort de Villey-le-Sec, France
• Vimy Memorial - Grange Tunnel, France
• Múzeum Vín Prešov, Slovakia
• Vịnh Mốc tunnels, Vietnam
• Santuario de la Virgen de la Balma, Spain
• Virgilkapelle, Austria
• Tomb of the Virgin Mary, Israel
• Festung Vitznau, Switzerland
• Vodojemy Brno, Czech Republic
• Voice of Biafra Bunker, Nigeria
• Sub Terra Vorau, Austria
• Vulcania, France
• Vulkan Brauerei, Germany
• Wabasha Street Caves, United States of America
• Le Fort Wagner, France
• Podziemne Fabryki Walimia, Poland
• Sandsteinhöhle in Walldorf, Germany
• Wanfotang Grottoes, China
• Warana Raja Maha Viharaya, Sri Lanka
• War H.Q. Tunnels, Malta
• Warren’s Shaft, Israel
• Nürnberger Wasserstollen und Kasematten, Germany
• Wattson and Wattson Jewelry Store, United States of America
• Floyd Collins Museum, United States of America
• Kanaltunnel Weilburg, Germany
• Weißenstädter Kellerwelt, Germany
• Wellington Caves, France
• Felsenkeller Kloster Weltenburg, Germany
• Western Approaches Command Centre, Great Britain
• The Western Wall Tunnels, Israel
• West Norwood Cemetery Catacombs, Great Britain
• Westwallmuseum Pirmasens, Germany
• Westwallmuseum Irrel, Germany
• Westwallmuseum Bad Bergzabern, Germany
• Westwallmuseum Sinz, Germany
• Westwallmuseum Mettlach, Germany
• Westwallmuseum Wiltingen, Germany
• Westwallmuseum Konz, Germany
• West Wycombe Caves, Great Britain
• Weta Cave, New Zealand
• White Cliffs, Australia
• Höhlenburg Wichenstein, Switzerland
• Wienerwaldmuseum, Austria
• Nederlands Wijnmuseum Arnhem, Netherlands
• Williamson’s Tunnels, Great Britain
• Windber Coal Heritage Center, United States of America
• Włodarz Complex, Poland
• Wolfsschanze, Poland
• Bunker Wollenberg, Germany
• Wonambi Fossil Centre, Australia
• World War II Tunnels, Great Britain
• Erdstall im Gasthof Wösner, Austria
• Bunkerpark Wünsdorf, Germany
• Bunkermuseum Wurzenpass, Austria
• Tham Xang, Laos
• Xarbes Caves, Iran
• Xlendi Emergency Flour Mill, Malta
• Xuan Kong Si, China
• Yaechika, Japan
• Yangling Museum, China
• Yekedeshik Cave City, Turkmenistan
• Yeletskyi Monastery, Ukraine
• Yemrehanna Kristos Church, Ethiopia
• Yerebatan Sarnıçı - Cistern Basilica, Turkey
• Yokoi’s Cave, Guam
• Yoshimi Hyakuana, Japan
• Yucca Mountain Science Center, United States of America
• Yuhuang Cave, China
• Yulin Grotto, China
• Yunak Evleri, Turkey
• Yungang Grottoes, China
• Zarni-Parni Cave Fortress, Armenia
• Tomb of Zechariah, Israel
• Industriemuseum Zeche Hannover, Germany
• Unterirdisches Zeitz, Germany
• Restaurant Železná Růže, Czech Republic
• Zelve Monastery, Turkey
• Zeniarai Benzaiten Ugafuku Shrine, Japan
• Zhaishan Tunnel, China
• Zhangfang Ancient Battle Tunnel, China
• Zigzag Path, Great Britain
• Zion, Matrix
• Historická Pivnica Zlatý Strapec, Slovakia
• Znojmo Podzemi, Czech Republic
• Zoo de Doué la Fontaine, France
• Bunkermuseum Zoutelande, Netherlands
• Casa Rupestre Zovencedo, Italy
• Zum Turm, Italy