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Tourist route, Wieliczka Salt Mine, UNESCO World Heritage Site, Krakow, Malopolska, Poland, Europe
Cueva de las Manos (Cave of Hands), UNESCO World Heritage Site, a cave or series of caves located in the province of Santa Cruz, 163 km south of the town of Perito Moreno, Patagonia, Argentina
Tourist route, Chapel of St. Kinga, Wieliczka Salt Mine, UNESCO World Heritage Site, Krakow, Malopolska, Poland, Europe
Commuters at Canary Wharf underground station taken as the sun was setting, Docklands, London, England, United Kingdom, Europe
Salt mine of Nemocon, Colombia, South America
London tube, London, England, United Kingdom, Europe
A stick figure cave painting at Cueva de las Mano (Cave of Hands), UNESCO World Heritage Site, Patagonia, Argentina, South America
Art nouveau entrance to the Metro Station at Cafe Kleber, Trocadero, Paris, Ile de France, France, Europe
Cavers in Hang Roc (Ruc Mon) cave in Phong Nha, Quang Binh, Vietnam, Indochina, Southeast Asia, Asia
The illuminated interior of Paradise Cave in Phong Nha Ke Bang National Park, Quang Binh, Vietnam, Indochina, Southeast Asia, Asia
Hikers in the interior of Galaxy cave on the Ben Dang River in Thien Ha, Ninh Binh, Vietnam, Indochina, Southeast Asia, Asia
Mine shaft behind the Great Laxey Wheel, Isle of Man, crown dependency of the United Kingdom, Europe
Rudolf Mine in Salina Turda salt mine in Turda city, Romania, Europe
Underground lake in the Salt Mine, Salina Turda museum in Transylvania, Romania, Europe
Salina Turda, underground salt mine tourist attraction in Turda city, Romania, Europe
Tunnel of Salina Turda, well known landmark in Turda, Transylvania, Romania, Europe
Marble Cave of Fantiscritti, Carrara, Tuscany, Italy, Europe
Pueblo Kiva, Pecos National Historical Park, Pecos, New Mexico, United States of America, North America
Cave system, Minami Daito, Daito Islands, Japan, Asia
Seemingly never ending main tunnel at Schoenenbourg Fortress, Bas-Rhin department, France, Europe
The Underground of the Flavian Amphitheater, the third largest Roman amphitheater in Italy, Pozzuoli, Naples, Campania, Italy, Europe
Interior of Basilica Cistern, Sultanahmet, Istanbul, Turkey, Europe
Manjanggul Lava Tube, UNESCO World Heritage Site, Jeju Island, South Korea, Asia
Manjanggul longest lava tube system in the world on the island of Jejudo, UNESCO World Heritage Site, South Korea, Asia
A Paris metro train leaves Cite station, Paris, France, Europe
Underground halls, Diocletians Palace, UNESCO World Heritage Site, Split, Dalmatian Coast, Croatia, Europe
Tourist exploring the underground halls at Diocletians Palace, UNESCO World Heritage Site, Split, Dalmatian Coast, Croatia, Europe
Metro sign, Paris, France, Europe
Lake of the Clouds, Carlsbad Caverns National Park, UNESCO World Heritage Site, New Mexico, United States of America, North America
Patterns in eroded rocks, Upper Antelope Canyon (Slot Canyon), Page, Arizona, USA
Upper Antelope, a slot canyon, Arizona, United States of America (U.S.A.), North America
