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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

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

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

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

Outrigger cruising on the waters near the Puerto Princesa underground river, Palawan, Philippines, Southeast Asia, Asia

Tourist exploring the underground halls at Diocletian's Palace, UNESCO World Heritage Site, Split, Dalmatian Coast, Croatia, Europe

Limestone stalactites and stalagmites in Ballic Cave, near Tokat, Central Anatolia, Turkey, Asia Minor, Eurasia

Limestone stalactites and stalagmites in Ballic Cave, near Tokat, Central Anatolia, Turkey, Asia Minor, Eurasia

One of the Stations of the Cross, Salt Cathedral of Zipaquira, Cundinamarca department, Savannah of Bogota, Colombia, South America

Main altar in the new Salt Cathedral of Zipaquira, Cundinamarca department, Savannah of Bogota, Colombia, South America

Former Mine Working Slate Cavern Tunnel at Dinorwig Quarry (Dinorwic Quarry), Eryri (Snowdonia National Park), North Wales, United Kingdom

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

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

Tourist route, Chapel of St. Kinga, 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

Oak barrels of Rioja wine at Carlos San Pedro Bodega winery in medieval town of Laguardia in Basque country, Spain

Tourists on foot study Metropolitain subway map for the Paris Metro in Rue du Bac, Left Bank, Paris, France

Tourists on guided tour of Sterkfontein Caves, UNESCO World Heritage Site, Gauteng, South Africa, Africa

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

Crypt, Lecce Cathedral (Cathedral of Maria Santissima Assunta and Sant'Oronzo), Lecce, Salento, Apulia, Italy

Underground Wine tasting area in the cellars of Cricova, one of the largest wineries of the world, Moldova, Europe

LKAB mining tour, largest underground iron ore mine in the world, Kiruna, Lapland, Arctic Circle, Sweden, Scandinavia, Europe

A tourist walking through The Underground German Hospital in Guernsey, Channel Islands, United Kingdom, Europe

Underground Wine tasting area in the cellars of Cricova, one of the largest wineries of the world, Moldova, Europe

LKAB mining tour, largest underground iron ore mine in the world, Kiruna, Lapland, Arctic Circle, Sweden, Scandinavia, Europe

Manjanggul longest lava tube system in the world on the island of Jejudo, UNESCO World Heritage Site, South Korea, Asia

Tourists exploring the underground halls at Diocletian's Palace, UNESCO World Heritage Site, Split, Croatia, Europe

Swimming at Cenote Ik Kil in Yucatan, Mexico, a natural pit, or sinkhole near Chichen Itza. Yucatan Peninsula, Quintana Roo, Mexico. Ik Kil was sacred to the Mayans who used this cenote for both relaxation and ritual services centuries ago.

Gran Cenote de Tulum in Yucatan Peninsula, Quintana Roo, Mexico. There are thousands of cenotes dotted all over Mexico���s Yucatan Peninsula, and their existence is as much a defining characteristic of the region as is the distinct geological feature from which they result. Once revered by the ancient Mayans as sacred wells, they are now magnets for tourists, adventurers, and explorers alike.

Cenote Ik Kil in Yucatan, Mexico, a natural pit, or sinkhole near Chichen Itza. Yucatan Peninsula, Quintana Roo, Mexico. Ik Kil was sacred to the Mayans who used this cenote for both relaxation and ritual services centuries ago.

The Lovo underground furnace opens to passengers of cruise ship MV Reef Endeavor (Captain Cook Cruises Fiji) during a nightly village visit, Gunu, Naviti Island, Yasawa Group, Fiji Islands, South Pacific

Metro Shanghai, mass transportation system, subway, public transport, underground station, commuters

Evening shot of traffic and the classic London Underground sign. Shot in Piccadilly Circus in London, UK.

Metro Shanghai, Info screen, mass transportation system, subway, public transport, underground station, platformcommuters

Metro Shanghai, mass transportation system, subway, public transport, underground station, Guard, commuters

Tourist stands inside the arc natural cave in portocolom, mallorca, admiring the scenic view of a lighthouse across the blue waters

Tourist walking on a concrete walkway inside the famous postojna cave in slovenia, admiring the stalactites and stalagmites during a guided tour

Tourists walking on a footpath and exploring the magnificent postojna cave in slovenia, a popular tourist attraction