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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
Rudolf Mine in Salina Turda salt mine in Turda city, Romania, Europe
Tunnel of Salina Turda, well known landmark in Turda, Transylvania, Romania, Europe
Mine shaft behind the Great Laxey Wheel, Isle of Man, crown dependency of the United Kingdom, Europe
Inside ice cave under the Vatnajokull Glacier, with cave guide looking up to hole in cave roof, near Jokulsarlon, South Iceland, Polar Regions
Underground lake in the Krizna Jama karst cave, Slovenia, Europe
Underground lake in the Krizna Jama karst cave, Slovenia, Europe
A tourist walking through The Underground German Hospital in Guernsey, Channel Islands, United Kingdom, Europe
Underground sign and people entering entering tube station on a rainy day, London, England, United Kingdom, Europe
Tourists inside Aillwee Cave, The Burren, County Clare, Munster, Republic of Ireland, Europe
Tourists inside Aillwee Cave, The Burren, County Clare, Munster, Republic of Ireland, Europe
Wieliczka Salt Mine Tourist Route, Chapel of St. Kinga staircase in Kopalnia soli Wieliczka, UNESCO World Heritage Site, Krakow, Poland, Europe
Wieliczka Salt Mine Tourist Route, Chapel of St. Kinga with chandeliers in Kopalnia soli Wieliczka, UNESCO World Heritage Site, Krakow, Poland, Europe
Wieliczka Salt Mine Tourist Route, Chapel of St. Kinga with carved details in Kopalnia soli Wieliczka, UNESCO World Heritage Site, Krakow, Poland, Europe
Salt Cathedral, interior, Zipaquira, Cundinamarca Department, Colombia, South America
Salt Cathedral, interior, Zipaquira, Cundinamarca Department, Colombia, South America
Salt Cathedral, interior, Zipaquira, Cundinamarca Department, Colombia, South America
Salt Cathedral, interior, Zipaquira, Cundinamarca Department, Colombia, South America
St. John's Wood tube station, St John's Wood, London, England, United Kingdom, Europe
Wood blewit, Lepista nuda, mushrooms grow in underground cave at Le Saut Aux Loups at Montsoreau, France
Place de la Concorde subway station, Paris, France, Europe
LKAB mining tour, largest underground iron ore mine in the world, Kiruna, Lapland, Arctic Circle, Sweden, Scandinavia, Europe
Moscow metro station, Moscow, Russia, Europe
Underground Metro subway, Madrid, Spain, Europe
Underground Metro subway, Madrid, Spain, Europe
Mortimer's Hole, a medieval passageway beneath the Castle, one of the many caves cut in the sandstone beneath the city centre, Nottingham, Nottinghamshire, England, United Kingdom, Europe
Metro sign, Boulevard Saint Germain, Paris, France
London Tube train in motion, London, England, United Kingdom, Europe
LKAB mining tour, largest underground iron ore mine in the world, Kiruna, Lapland, Arctic Circle, Sweden, Scandinavia, Europe
Lake of the Clouds, Carlsbad Caverns National Park, UNESCO World Heritage Site, New Mexico, United States of America, North America
Metro sign, Rome, Lazio, Italy, Europe
Tsim Sha Tsui MTR subway station, Kowloon, Hong Kong, China, Asia
Ancient karez, underground irrigation system, Pakistan, Asia
District Line platforms, Earls Court Underground Station, London, England, United Kingdom, Europe
Copacabana Metro station, Rio de Janeiro, Brazil, South America
Entrance to King's Cross Station on Pancras Road, London, England, United Kingdom, Europe
Ancient Greek water reservoirs in the underground beneath Naples, Campania, Italy, Europe
Cave guide wearing protective hard hat inside one of the ice caves under the Vatnajokull Glacier, South Iceland, Polar Regions
The Underground German Hospital in Guernsey
Entrance to the metro at Abbesses, Montmartre, Paris, France, Europe
Metro Station, Moscow, Russia, Europe
Omotesando subway station entrance in the upmarket shopping district of Shibuya, Tokyo, Japan, Asia
Westminster Underground Station, Jubilee Line, London, England, United Kingdom, Europe
Hollywood and Vine Station, Metro (underground public transport system), Hollywood, Los Angeles, California, United States of America, North America
Gloucester Road tube station, London, England, United Kingdom, Europe
Commuters at Canary Wharf underground station taken as the sun was setting, Docklands, London, England, United Kingdom, Europe
Kings Cross Underground and Rail Station, London, England, United Kingdom, Europe
Leicester Square underground station with passing train, London, England, United Kingdom, Europe
Passengers on the Beijing subway, Beijing, China, Asia
Atta Cave near Attendorn, Sauerland, North Rhine-Westphalia, Germany, Europe
Visit to Gold Mine Reef, Gold Reef City, Johannesburg, South Africa, Africa
Fountain in Underground Atlanta, Atlanta, Georgia, United States of America, North America
Kievskaya Metro Station, Moscow, Russia, Europe
Underground Metro (Subway) in Kiev, Ukraine, Europe
Underground Metro Station, Seoul, South Korea, Asia
Bank Underground Station Central Line platform, London, England, United Kingdom, Europe
Carlsbad Caverns, Carlsbad Caverns National Park, UNESCO World Heritage Site, New Mexico, United States of America, North America
Person waiting at Waterloo underground station for the tube, London, England, United Kingdom, Europe
Metro sign, Madrid, Spain
Great Eastern Street, London, E1, England, United Kingdom, Europe
Metro Station, Moscow, Russia, Europe
Tourists exploring the underground halls at Diocletian's Palace, UNESCO World Heritage Site, Split, Croatia, Europe
Jubilee Line train at Southwark Station, London, England, United Kingdom, Europe
Harrisons Cave, Barbados, West Indies, Caribbean, Central America
Entrance to antichamber of underground mausoleum, Ting Ling (tomb of Emperor Wan Li), Ming Tombs, near Beijing, China, Asia
Grottes de Lacave, Dordogne, France, Europe
London Tube train in motion, London, England, United Kingdom, Europe
Interior of Christian tombs in St. Pauls catacombs on Malta, Europe
Tsim Sha Tsui MTR subway station, Kowloon, Hong Kong, China, Asia
Subway, Tokyo, Japan, Asia
Metro sign, Boulevard Saint Germain, Paris, France
Crypt, Basilica of Santa Maria in Cosmedin, Rome, Lazio, Italy, Europe
Bank Underground Station Central Line platform, London, England, United Kingdom, Europe
Underground station, Stockholm, Sweden, Scandinavia, Europe
Subway, Manhattan, New York City, United States of America, North America
Jubilee Line Underground station entrance, Canary Wharf, Docklands, London, England, United Kingdom, Europe
London Tube train, London, England, United Kingdom, Europe
Passengers on the platform and a yellow train, Mendelsshon U-Bahn station, Berlin, Germany, Europe
Subterranean Naples, part of an ancient Greek underground water cistern system, now open to tourists, Campania, Italy, Europe
Harrison's Cave, Barbados, West Indies, Caribbean, Central America
Underground train passengers, Kuala Lumpur, Malaysia, Southeast Asia, Asia
Underground Atlanta, Atlanta, Georgia, United States of America, North America
Underground Metro Station, Seoul, South Korea, Asia
The metro of Pyongyang, Norh Korea, Asia
The metro of Pyongyang, Norh Korea, Asia
Underground Atlanta, Atlanta, Georgia, United States of America, North America
Asakusa metro station, Tokyo, Japan, Asia
Underground cave dwelling, Matmata, Tunisia, North Africa, Africa
Metro platform, Namesti Republiky, Prague, Czech Republic, Europe
Arbatskaya Metro Station, Moscow, Russia, Europe
Rock formations in the interior of the Cango Caves, near Oudtshoorn, South Africa, Africa
Interchange at metro station, Budapest, Hungary, Europe
District Line platforms, Earls Court Underground Station, London, England, United Kingdom, Europe
Underground church, Coober Pedy, South Australia, Australia, Pacific
Taman Sari (Water Garden), underground mosque, Jogyakarta, Java, Indonesia, Southeast Asia, Asia
Tsim Sha Tsui MTR subway station, Kowloon, Hong Kong, China, Asia
London tube, London, England, United Kingdom, Europe
Metro underground train coming into station, Paris, France, Europe
Embankment station, London, England, United Kingdom, Europe