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Wine cellar, Chateau Verrazzano, Chianti, Tuscany, Italy, Europe
Rock cut reclining statue of the Buddha preparing to enter nirvana, in cave 26, a chaitya in the Buddhist cave site at Ajanta, carved from a gorge in the Waghore River, Ajanta, Maharashtra State, India.
Upper Antelope, a slot canyon, Arizona, United States of America (U.S.A.), North America
Blurred motion of underground train leaving station, London, England, United Kingdom, Europe
Tourist boat floating through the Puerto Princesa underground river, the New Wonder of the World, Puerto-Princesa Subterranean River National Park, UNESCO World Heritage Site, Palawan, Philippines, Southeast Asia, Asia
Sandy beach in front of the entrance to the New wonder of the world, the Puerto Princesa underground river, UNESCO World Heritage Site, Palawan, Philippines, Southeast Asia, Asia
Sandy beach in front of the entrance to the New wonder of the world and UNESCO World Heritage Site, the Puerto Princesa underground river, Palawan, Philippines, Southeast Asia, Asia
Tourists in a rowing boat entering the Puerto Princesa underground river, the New Wonder of the World, Puerto-Princesa Subterranean River National Park, UNESCO World Heritage Site, Palawan, Philippines, Southeast Asia, Asia
Puerto Princesa underground river, the New Wonder of the World, Puerto-Princesa Subterranean River National Park, UNESCO World Heritage Site, Palawan, Philippines, Southeast Asia, Asia
Outrigger cruising on the waters around the New wonder of the world and UNESCO World Heritage Site, the Puerto Princesa underground river, Palawan, Philippines, Southeast Asia, Asia
Tourist boat floating through the Puerto Princesa underground river, the New Wonder of the World, Puerto-Princesa Subterranean River National Park, UNESCO World Heritage Site, Palawan, Philippines, Southeast Asia, Asia
Manjanggul Lava Tube, UNESCO World Heritage Site, Jeju Island, South Korea, Asia
Manjanggul Lava Tube, UNESCO World Heritage Site, Jeju Island, South Korea, Asia
Passengers on moving on escalators on the Beijing subway, Beijing, China, Asia
Interior of Komsomolskaya Metro Station, Moscow, Russia, Europe
Neon Subway sign, Times Square, Manhattan, New York City, United States of America, North America
Drivers eye view of Circle line train entering tube station, London, England, United Kingdom, Europe
Mind The Gap sign at Bank Underground Station, London Underground, London, England, United Kingdom, Europe
Forum, Cryptoporticoes, UNESCO, Arles, Bouches du Rhone, Camargue, Provence-Alpes-Cote d'Azur, France
Forum, Cryptoporticoes, UNESCO, Arles, Bouches du Rhone, Camargue, Provence-Alpes-Cote d'Azur, France
MIND THE GAP sign on platform edge, London Underground, London, England, United Kingdom, Europe
Manjanggul Lava Tube, UNESCO World Heritage Site, Jeju Island, South Korea, Asia
Wooden wine barrels and mould on walls of wine cellar of winemaker Petr Marada, village of Mikulcice, Brnensko, Czech Republic, Europe
Medusa Head, Byzantine Basilica Cistern, Sunken or Underground Palace, Sultanahmet, Istanbul, Turkey, Europe
Hikers in the interior of Galaxy cave on the Ben Dang River in Thien Ha, Ninh Binh, Vietnam, Indochina, Southeast Asia, Asia
Cavers in Hang Roc (Ruc Mon) cave in Phong Nha, Quang Binh, Vietnam, Indochina, Southeast Asia, Asia
Underground Station entrance, snow storm, Piccadilly Circus, West End, London, England, United Kingdom, Europe
Algar do Carvao Natural Reserve cave, Island of Terceira, Azores, Portugal, Atlantic, Europe
Open-air and underground ruins of a 1st century Roman circus (chariot-racing track) and Tower, UNESCO World Heritage Site, Tarragona, Catalonia, Spain, Europe
St. John Cave, Patmos, Dodecanese, Greek Islands, Greece, Europe
Marble quarries, Carrara, Tuscany, Italy, Europe
Marble quarries, Carrara, Tuscany, Italy, Europe
The Aillwee Cave, The Burren, County Clare, Munster, Republic of Ireland, Europe
Underground Tourist Route, Rzeszow, Poland, Europe
Big Ben and the Houses of Parliament with Underground sign, London, England, United Kingdom, Europe
The illuminated interior of Paradise Cave in Phong Nha Ke Bang National Park, Quang Binh, Vietnam, Indochina, Southeast Asia, Asia
Outrigger cruising on the waters near the Puerto Princesa underground river, Palawan, Philippines, Southeast Asia, Asia
Sunken, rock-hewn Christian church, in rural landscape, Lalibela, UNESCO World Heritage Site, Ethiopia, Africa
Underground Tourist Route, Rzeszow, Poland, Europe
Algar do Carvao Natural Reserve cave, Island of Terceira, Azores, Portugal, Atlantic, Europe
Metro escalator, Kiev, Ukraine, Europe
An El train on the Elevated train system crossing Wells Street Bridge, Chicago, Illinois, United States of America, North America
Tourist exploring the underground halls at Diocletian's Palace, UNESCO World Heritage Site, Split, Dalmatian Coast, Croatia, Europe
Wooden wine barels in sandstone wine cellar, Novy Saldorf, Brnensko, Czech Republic, Europe
Interior of Basilica Cistern, Sultanahmet, Istanbul, Turkey, Europe
An El train on the Elevated train system crossing Wells Street Bridge, Chicago, Illinois, United States of America, North America
Subway station and train in motion, Manhattan, New York City, New York, United States of America, North America
Underground Tourist Route, Rzeszow, Poland, Europe
Wooden wine barrels and glass containers at wine cellar, village of Blatnice pod svatym Antoninkem, Brnensko, Czech Republic, Europe
The illuminated interior of Paradise Cave in Phong Nha Ke Bang National Park, Quang Binh, Vietnam, Indochina, Southeast Asia, Asia
Interior of Shanghai Metro station, Shanghai, China, Asia
Metro, underground train station, Mexico City, Mexico, North America
Limestone stalactites and stalagmites in Ballic Cave, near Tokat, Central Anatolia, Turkey, Asia Minor, Eurasia
Subway station Westfriedhof, Munich, Bavaria, Germany, Europe
Subway station and train in motion, Manhattan, New York City, New York, United States of America, North America
Underground Station, Canary Wharf, Docklands, London, United Kingdom, Europe
Metro stations at Puenta de la Exposicion, Valencia, Spain, Europe
Limestone stalactites and stalagmites in Ballic Cave, near Tokat, Central Anatolia, Turkey, Asia Minor, Eurasia
Metro station platform, Moscow, Russia, Europe
A Paris metro train leaves Cite station, Paris, France, Europe
One of the many 100 metre deep subway stations on the Pyongyang subway network, Pyongyang, Democratic People's Republic of Korea (DPRK), North Korea, Asia
The newlyweds in the underground catacombs of San Gaudioso (St. Gaudiosus), Naples, Campania, Italy, Europe
The underground catacombs of San Gaudioso (St. Gaudiosus), Naples, Campania, Italy, Europe
Subway station and train in motion, Manhattan, New York City, New York, United States of America, North America
One of the many 100 metre deep subway stations on the Pyongyang subway network, Pyongyang, Democratic People's Republic of Korea (DPRK), North Korea, Asia
Underground room at Eski Gumusler Monastery, UNESCO World Heritage Site, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia
The Carlo Vanvitelli underground basilica of the SS Annunziata (Basilica della Santissima Annunziata Maggiore), Naples, Campania, Italy, Europe
Elevated view of the Santiago metro, Santiago, Chile, South America
The Underground of the Flavian Amphitheater, the third largest Roman amphitheater in Italy, Pozzuoli, Naples, Campania, Italy, Europe
An El train on the Elevated train system, Chicago, Illinois, United States of America, North America
Underground Station, Berlin, Germany, Europe
Underground train, Milan, Lombardy, Italy, Europe
The Underground of the Flavian Amphitheater, the third largest Roman amphitheater in Italy, Pozzuoli, Naples, Campania, Italy, Europe
The Aillwee Cave, Burren, County Clare, Munster, Republic of Ireland, Europe
Ancient dungeons for Christians, Meknes, Morocco, North Africa, Africa
People in the subway station, Milan, Lombardy, Italy, Europe
Underground halls, Diocletian's Palace, UNESCO World Heritage Site, Split, Dalmatian Coast, Croatia, Europe
Vorosmarty Ter metro station, Budapest, Hungary, Europe
School of silversides form shapes in the tunnels at Eden Rock, Grand Cayman.
An adult American Eel (Anguilla rostrata) prowls along the edge of the Morrison Springs cavern at 85 feet deep watching over the adolescent eels in the clear freshwaters of the state park near Red Bay, Florida.
Metropolitain (Metro) station entrance, Paris, France, Europe
Interior of Chalk Farm Underground station on the Northern Line, empty during the Covid-19 lockdown, London, England, United Kingdom, Europe
The Sunken Rock Hewn church of Bet Giyorgis (St George), Lalibela, Northern Ethiopia, Ethiopia, Africa *** Local Caption *** The most famous of Lalibela's Rock Hewn churches, The Sunken Rock Hewn church of Bet Giyorgis, 'St. George', dating from the 12th Century, Lalibela's Rock Hewn Churches rank amoung the greatest religio-historical sites, not only in the African continent but in the Christian World
MIND THE GAP sign on platform edge, London Underground, London, England, United Kingdom, Europe
U-bahn subway station sign in new urban development in Potsdamer Platz, Berlin, Germany, Europe
Hong Kong mass transit railway system (MTR), Hong Kong, China, Asia
Entrance of Bunk'art 2 exhibiting photos of convicts by the communist regime between 1912 and 1991, Abdi Toptani Street in downtown Tirana, Albania, Europe
Snorkelers swim above a blue hole on Palau's barrier reef. This hole formed when sea level was much lower than it is today.
Canary Wharf Underground Station, Canary Wharf, Docklands, London, England, United Kingdom, Europe
Greenwich Foot Tunnel, interior, Greenwich, London, England, United Kingdom, Europe
Underground Metro (Subway) in Kiev, Ukraine, Europe
Soviet-era nuclear bunker, central Tirana, Albania, Europe
Village Underground Lisboa, an international platform for creativity, art, and culture, built with two buses and 14 shipping containers converted into creative spaces, Lisbon, Portugal, Europe
Village Underground Lisboa, an international platform for creativity, art, and culture, built with two buses and 14 shipping containers converted into creative spaces, Lisbon, Portugal, Europe
Tuzluca salt mine used for halotherapy, Tuzluca, Turkey, Asia Minor, Asia
A young married couple celebrate their ten year anniversary by scuba diving in the clear freshwaters of Devil's Den Springs, a sinkhole in Williston, Florida, as the afternoon sun filters down into the cavern.
A technical cave diver using a diver propulsion vehicle (DPV) to dive into the Blue Springs state park cave system near Marianna, Florida.
Technical diver in cave system, Mexico.
Diver using side mount gear in cave in Mexico.
Diver enters the cavern system at Chac Mool cenote in the Riviera Maya area of Mexico's Yucatan Peninsula.