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Subway sign, Plaza de Mayo, Buenos Aires, Argentina, South America
Commuters inside train in rush hour, Tokyo Subway, Tokyo, Honshu, Japan, Asia
Ice cave in Vatnajokull glacier, Iceland, Polar Regions
Neon lights of Ginza at night, Ginza, Tokyo, Honshu, Japan, Asia
The Crusader Citadel built by the Knights Hospitaller, UNESCO World Heritage Site, Akko, Israel, Middle East
Aerial of the Koko Oana underground lava tube, Anaa atoll, Tuamotu archipelago, French Polynesia, South Pacific, Pacific
Tokyo Subway, Tokyo, Honshu, Japan, Asia
The Hospitaller Knights Halls, beneath the Crusader Citadel, UNESCO World Heritage Site, Akko, Israel, Middle East
Potsdamer Platz underground sign, Berlin, Germany, Europe
The Hospitaller Knights Halls, beneath the Crusader Citadel, UNESCO World Heritage Site, Akko, Israel, Middle East
Speleothems, Davies Springs, Carlsbad Caverns National Park, UNESCO World Heritage Site, New Mexico, United States of America, North America
Cleveland Avenue passage in Mammoth Cave System, Kentucky, United States of America, North America
Guilin Cave, floodlit stalactites and stalagmites, China, Asia
Carlsbad Caverns, Carlsbad Caverns National Park, UNESCO World Heritage Site, New Mexico, United States of America, North America
Cave diver lights airspace with flare, inspecting geological formations, Pont Den Gil cave, Menorca, Balearic Islands, Spain, Europe
A gold mine shaft, South Africa, Africa
Underground cave dwelling, Matmata, Tunisia, North Africa, Africa
Cellar, wine production, Saarburg, Saar-Valley, Germany, Europe
Mine in Cerro Rico, richest hill on earth, hand mining of silver and zinc today, Potosi, Bolivia, South America
Kievskaya Metro station, Moscow, Russia, Europe
Abbesses Metro station, Paris, France, Europe
Manjanggul longest lava tube system in the world on the island of Jejudo, UNESCO World Heritage Site, South Korea, Asia
Carlsbad Caverns, Carlsbad Caverns National Park, UNESCO World Heritage Site, New Mexico, United States of America, North America
A statue of Zoya Kosmodemyanskaya, brave woman partisan fighter during WWII, at Partisanskaya metro station, Moscow, Russia, Europe
A statue of Zoya Kosmodemyanskaya, brave woman partisan fighter during WWII, at Partisanskaya metro station, Moscow, Russia, Europe
Tourist route, Wieliczka Salt Mine, UNESCO World Heritage Site, Krakow, Malopolska, Poland, Europe
Tourist route, Chapel of St. Kinga, Wieliczka Salt Mine, UNESCO World Heritage Site, Krakow, Malopolska, Poland, Europe
Miners route, Wieliczka Salt Mine, UNESCO World Heritage Site, Krakow, Malopolska, Poland, Europe
Tourist route, Chapel of St. Kinga, Wieliczka Salt Mine, UNESCO World Heritage Site, Krakow, Malopolska, Poland, Europe
Miners route, Wieliczka Salt Mine, UNESCO World Heritage Site, Krakow, Malopolska, Poland, Europe
A train pulls into a station on the Lyon metro system, Lyon, Rhone, Rhone-Alpes, France, Europe
Wood blewit, Lepista nuda, mushrooms growing underground in compost in cave in the Loire Valley, France
Wood blewit, Lepista nuda, mushrooms growing underground in compost in cave in the Loire Valley, France
Oak barrels of Rioja wine at Carlos San Pedro Bodega winery in medieval town of Laguardia in Basque country, Spain
Metropolitain sign and map on Rue du Bac, Paris, France
Tourists on foot study Metropolitain subway map for the Paris Metro in Rue du Bac, Left Bank, Paris, France
Metropolitain sign in Rue du Bac, Paris, France
Tourists on guided tour of Sterkfontein Caves, UNESCO World Heritage Site, Gauteng, South Africa, Africa
Subway, Delhi, India, Asia
Underground metro station, Kiev, Ukraine, Europe
Underground station entrance, Piccadilly Circus, London, England, United Kingdom, Europe
Crypt, Lecce Cathedral, Cathedral of Maria Santissima Assunta and Sant'Oronzo, Lecce, Salento, Apulia, Italy
Crypt, Lecce Cathedral (Cathedral of Maria Santissima Assunta and Sant'Oronzo), Lecce, Salento, Apulia, Italy
LKAB mining tour, largest underground iron ore mine in the world, Kiruna, Lapland, Arctic Circle, Sweden, Scandinavia, Europe
LKAB mining tour, largest underground iron ore mine in the world, Kiruna, Lapland, Arctic Circle, Sweden, Scandinavia, Europe
Underground/tube sign, London, England, United Kingdom, Europe
Marble Cave of Fantiscritti, Carrara, Tuscany, Italy, Europe
Salina Turda, underground salt mine tourist attraction in Turda city, Romania, Europe
Rudolf Mine in Salina Turda salt mine in Turda city, 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 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
Underground Metro subway, Madrid, Spain, Europe
Salt Cathedral, interior, Zipaquira, Cundinamarca Department, Colombia, South America
Entrance to tube station, advertisement, Piccadilly Circus, London, England, United Kingdom, Europe
Manjanggul longest lava tube system in the world on the island of Jejudo, UNESCO World Heritage Site, South Korea, Asia
Underground Metro subway, Madrid, Spain, Europe
Art nouveau entrance to the Metro Station at Cafe Kleber, Trocadero, Paris, Ile de France, France, Europe
A train pulls out of a station on the Lyon metro system, Lyon, Rhone, Rhone-Alpes, France, Europe
Wood blewit, Lepista nuda, mushrooms grow in underground troglodyte cave at Le Saut Aux Loups at Montsoreau, France
Tourists walk past Metro sign in Boulevard Saint Germain, central Paris, France
Moscow metro station, Moscow, Russia, Europe
Yerebatan Saray, underground cistern, Istanbul, Turkey, Europe
Willoughby House cave, probably a folly that was a gentlemen's drinking room in the 1700s, one of the many caves cut in the sandstone beneath the city centre, Nottingham, Nottinghamshire, England, United Kingdom, Europe
Underground Wine tasting area in the cellars of Cricova, one of the largest wineries of the world, Moldova, Europe
Interior of modern Cermy Most metro station, Prague, Czech Republic, Europe
Manjanggul longest lava tube system in the world on the island of Jejudo, UNESCO World Heritage Site, South Korea, Asia
A variety of speleothems including stalactites, stalagmites, columns, straws and drapery at Ngilgi Cave, a limestone Karst cave system near Yallingup in the South West, Augusta-Margaret River Shire, Western Australia, Australia, Pacific
A tourist walking through The Underground German Hospital in Guernsey, Channel Islands, United Kingdom, Europe
Shop seller in the underground Grand Bazaar, Istanbul, Turkey, Europe
LKAB mining tour, largest underground iron ore mine in the world, Kiruna, Lapland, Arctic Circle, Sweden, Scandinavia, Europe
Metro sign, Rome, Lazio, Italy, Europe
Mayakovskaya Metro station, Moscow, Russia, Europe
Moscow metro station, Moscow, Russia, Europe
St. John's Wood tube station, St John's Wood, London, England, United Kingdom, Europe
Place de la Concorde subway station, Paris, France, Europe
Water reflecting columns at Basilica Cistern (Sunken Palace) subterranean water system underground, Istanbul, Turkey, Europe
Underground lake in the Krizna Jama karst cave, Slovenia, Europe
Metro sign, Boulevard Saint Germain, Paris, France
London Tube train in motion, London, England, United Kingdom, Europe
Underground Wine tasting area in the cellars of Cricova, one of the largest wineries of the world, Moldova, Europe
Underground lake in the Krizna Jama karst cave, Slovenia, Europe
The Underground German Hospital in Guernsey
Lake of the Clouds, Carlsbad Caverns National Park, UNESCO World Heritage Site, New Mexico, United States of America, North America
Manjanggul longest lava tube system in the world on the island of Jejudo, UNESCO World Heritage Site, South Korea, Asia
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
Wood blewit, Lepista nuda, mushrooms grow in underground cave at Le Saut Aux Loups at Montsoreau, France
District Line platforms, Earls Court Underground Station, 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