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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
Moscow metro station, Moscow, Russia, Europe
Manjanggul longest lava tube system in the world on the island of Jejudo, UNESCO World Heritage Site, South Korea, Asia
Passengers boarding Tokyo's Hibiya subway line, Tokyo, Japan, Asia
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
Interior of modern Cermy Most metro station, Prague, Czech Republic, 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
Place de la Concorde subway station, Paris, France, Europe
Crypt, Lecce Cathedral (Cathedral of Maria Santissima Assunta and Sant'Oronzo), Lecce, Salento, Apulia, Italy
Metro sign, Rome, Lazio, Italy, Europe
Wood blewit, Lepista nuda, mushrooms grow in underground cave at Le Saut Aux Loups at Montsoreau, France
Mayakovskaya Metro station, Moscow, Russia, Europe
District Line platforms, Earls Court Underground Station, London, England, United Kingdom, Europe
LKAB mining tour, largest underground iron ore mine in the world, Kiruna, Lapland, Arctic Circle, Sweden, Scandinavia, Europe
Ancient Greek water reservoirs in the underground beneath Naples, Campania, Italy, Europe
Underground lake in the Krizna Jama karst cave, Slovenia, Europe
The Underground German Hospital in Guernsey
Entrance to the metro at Abbesses, Montmartre, Paris, France, Europe
Lake of the Clouds, Carlsbad Caverns National Park, UNESCO World Heritage Site, New Mexico, United States of America, North America
Moscow metro station, Moscow, Russia, Europe
Ancient karez, underground irrigation system, Pakistan, Asia
St. John's Wood tube station, St John's Wood, London, England, United Kingdom, Europe
London Tube train in motion, 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
LKAB mining tour, largest underground iron ore mine in the world, Kiruna, Lapland, Arctic Circle, Sweden, Scandinavia, Europe
Underground lake in the Salt Mine, Salina Turda museum in Transylvania, Romania, Europe
Cave guide wearing protective hard hat inside one of the ice caves under the Vatnajokull Glacier, South Iceland, Polar Regions
Hollywood and Vine Station, Metro (underground public transport system), Hollywood, Los Angeles, California, United States of America, North America
Metro Station, Moscow, Russia, Europe
Omotesando subway station entrance in the upmarket shopping district of Shibuya, Tokyo, Japan, Asia
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
Visit to Gold Mine Reef, Gold Reef City, Johannesburg, South Africa, Africa
Atta Cave near Attendorn, Sauerland, North Rhine-Westphalia, Germany, Europe
Fountain in Underground Atlanta, Atlanta, Georgia, United States of America, North America
Passengers on the Beijing subway, Beijing, China, Asia
Gloucester Road tube station, London, England, United Kingdom, Europe
Westminster Underground Station, Jubilee Line, London, England, United Kingdom, Europe
Carlsbad Caverns, Carlsbad Caverns National Park, UNESCO World Heritage Site, New Mexico, United States of America, North America
Metro sign, Madrid, Spain
Kievskaya Metro Station, Moscow, Russia, Europe
Underground Metro (Subway) in Kiev, Ukraine, Europe
Jubilee Line train at Southwark Station, London, England, United Kingdom, Europe
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
Bank Underground Station Central Line platform, London, England, United Kingdom, Europe
London Tube train in motion, London, England, United Kingdom, Europe
Interior of Christian tombs in St. Pauls catacombs on Malta, Europe
Harrisons Cave, Barbados, West Indies, Caribbean, Central America
Subway, Tokyo, Japan, Asia
Subway, Manhattan, New York City, United States of America, North America
Person waiting at Waterloo underground station for the tube, London, England, United Kingdom, Europe
Harrison's Cave, Barbados, West Indies, Caribbean, Central America
Underground Metro Station, Seoul, South Korea, Asia
Metro sign, Boulevard Saint Germain, Paris, France
Jubilee Line Underground station entrance, Canary Wharf, Docklands, London, England, United Kingdom, Europe
Underground Atlanta, Atlanta, Georgia, United States of America, North America
Passengers on the platform and a yellow train, Mendelsshon U-Bahn station, Berlin, Germany, Europe
Underground station, Stockholm, Sweden, Scandinavia, Europe
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
Underground train passengers, Kuala Lumpur, Malaysia, Southeast Asia, Asia
Bank Underground Station Central Line platform, London, England, United Kingdom, Europe
Underground Atlanta, Atlanta, Georgia, United States of America, North America
Underground cave dwelling, Matmata, Tunisia, North Africa, Africa
Subterranean Naples, part of an ancient Greek underground water cistern system, now open to tourists, Campania, Italy, Europe
London Tube train, London, England, United Kingdom, Europe
Rock formations in the interior of the Cango Caves, near Oudtshoorn, South Africa, Africa
Metro platform, Namesti Republiky, Prague, Czech Republic, Europe
Underground Metro Station, Seoul, South Korea, Asia
The metro of Pyongyang, Norh Korea, Asia
District Line platforms, Earls Court Underground Station, London, England, United Kingdom, Europe
Taman Sari (Water Garden), underground mosque, Jogyakarta, Java, Indonesia, Southeast Asia, Asia
Arbatskaya Metro Station, Moscow, Russia, Europe
Metro underground train coming into station, Paris, France, Europe
The metro of Pyongyang, Norh Korea, Asia
Underground Atlanta, Atlanta, Georgia, United States of America, North America
Underground church, Coober Pedy, South Australia, Australia, Pacific
Hollywood and Vine Station, Metro (underground public transport system), Hollywood, Los Angeles, California, United States of America, North America
Asakusa metro station, Tokyo, Japan, Asia
Paris Metro station, Paris, France, Europe
Arbatskaya Metro Station, Moscow, Russia, Europe
Interchange at metro station, Budapest, Hungary, Europe
London tube, London, England, United Kingdom, Europe
Embankment station, London, England, United Kingdom, Europe
Piccadilly Circus, London, England, United Kingdom, Europe
Metro Station with train, Washington D.C., United States of America, North America
Underground church, Coober Pedy, South Australia, Australia, Pacific