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Inside the Big Room at Carlsbad Caverns National Park, UNESCO World Heritage Site, located in the Guadalupe Mountains, New Mexico, United States of America, North America

Inside the Big Room at Carlsbad Caverns National Park, UNESCO World Heritage Site, located in the Guadalupe Mountains, New Mexico, United States of America, North America

Popcorn in the main cave at Carlsbad Caverns National Park, UNESCO World Heritage Site, located in the Guadalupe Mountains, New Mexico, United States of America, North America

Entrance to the main cave at Carlsbad Caverns National Park,UNESCO World Heritage Site, located in the Guadalupe Mountains, New Mexico, United States of America, North America

View of visitors viewing stalagmites and stalactites in the interior of Cango Caves, Oudtshoorn, Western Cape, South Africa, Africa

View of stalagmites and stalactites in the interior of Cango Caves, Oudtshoorn, Western Cape, South Africa, Africa

View of stalagmites and stalactites in the interior of Cango Caves, Oudtshoorn, Western Cape, South Africa, Africa

Acik Saray (Open Palace) Museum, AD 900- 1000, Gulsehir, Cappadocia Region, Anatolia, Turkey, Asia Minor, Asia

The Real Cave of Pythagoras, interior, Mount Kerkis, Samos Island, North Aegean, Greek Islands, Greece, Europe

Long tail boat on Phra Nang Cave Beach on Railay in Ao Nang, Krabi Province, Thailand, Southeast Asia, Asia

Long tail boats on Phra Nang Cave Beach on Railay in Ao Nang, Krabi Province, Thailand, Southeast Asia, Asia

Floe stone in the main cave at Carlsbad Caverns National Park, UNESCO World Heritage Site, located in the Guadalupe Mountains, New Mexico, United States of America, North America

View of stalagmites and stalactites in the interior of Cango Caves, Oudtshoorn, Western Cape, South Africa, Africa

Ajanta Cave complex, Buddhist Temples carved into solid rock dating from the 5th Century BC, Ajanta, Maharastra, India

A view of the island of Deserta Grande, in the Ilhas Desertas, near the city of Funchal, Madeira, Portugal, Atlantic, Europe

Unconformity of older Jurassic sediments and Pliocene limestone plus later lava on top at Caleta Negra, Ajuy, Fuerteventura, Spain, Atlantic, Europe

Inside the Big Room at Carlsbad Caverns National Park, UNESCO World Heritage Site, located in the Guadalupe Mountains, New Mexico, United States of America, North America

Stalactites in the main cave at Carlsbad Caverns National Park, UNESCO World Heritage Site, located in the Guadalupe Mountains, New Mexico, United States of America, North America

View of visitors viewing stalagmites and stalactites in the interior of Cango Caves, Oudtshoorn, Western Cape, South Africa, Africa

Ajanta Cave complex, Buddhist Temples carved into solid rock dating from the 5th Century BC, Ajanta, Maharastra, India

The Real Cave of Pythagoras, Mount Kerkis, Samos Island, North Aegean, Greek Islands, Greece, Europe

Long tail boats on Phra Nang Cave Beach on Railay in Ao Nang, Krabi Province, Thailand, Southeast Asia, Asia

An adult female bighorn sheep (Ovis canadensis nelsoni), in a cave for shade in Grand Canyon National Park, Arizona, United States of America, North America

Inside the Big Room at Carlsbad Caverns National Park, UNESCO World Heritage Site, located in the Guadalupe Mountains, New Mexico, United States of America, North America

Entrance to the main cave at Carlsbad Caverns National Park, UNESCO World Heritage Site, located in the Guadalupe Mountains, New Mexico, United States of America, North America

Cave Houses, Pigeon Valley, Goreme, Cappadocia Region, Nevsehir Province, Anatolia, Turkey, Asia Minor, Asia

View of the blue sea from a natural sea cave of rocks shaped by wind, Punta Molentis, Villasimius, Cagliari, Sardinia, Italy, Mediterranean, Europe

Tower Ruins, Ancestral Pueblo, up to 1000 years old, Coomb Ridge area, Utah, United States of America, North America

Floe stone in the main cave at Carlsbad Caverns National Park, UNESCO World Heritage Site, located in the Guadalupe Mountains, New Mexico, United States of America, North America

Ajanta Cave complex, Buddhist Temples carved into solid rock dating from the 5th Century BC, Ajanta, Maharastra, India

Aerial of La Gueule du Monstre (the Monster's Mouth) cave, Rurutu, Austral islands, French Polynesia, South Pacific, Pacific

A waterfall running through the Mossy Cave Trail in Bryce Canyon National Park, Utah, United States of America, North America

Inside the Big Room at Carlsbad Caverns National Park, UNESCO World Heritage Site, located in the Guadalupe Mountains, New Mexico, United States of America, North America

Santana Cave, Atlantic Forest South-East Reserves, UNESCO World Heritage Site, Alto Ribeira Touristic State Park, Sao Paulo State, Brazil, South America

Long tail boat on Phra Nang Cave Beach on Railay in Ao Nang, Krabi Province, Thailand, Southeast Asia, Asia

Rock art pictographs of the Cochimi people, Palmarito Cave, Sierra San Francisco, UNESCO World Heritage Site, Baja California Sur, Mexico, North America

Rock art pictographs of the Cochimi people, Palmarito Cave, Sierra San Francisco, UNESCO World Heritage Site, Baja California Sur, Mexico, North America

A waterfall running through the Mossy Cave Trail in Bryce Canyon National Park, Utah, United States of America, North America

Caves in the cliff walls, used to store food by ancient Anasazi Indians, Canyon De Chelly National Monument, Arizona, United States of America, North America

Grand Canyon viewed through a rock cave below Lipan Point on the South Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

View over the village of Rhumsiki from a cave, Mandara mountains, Far North province, Cameroon, Africa

Cave Temple on Elephanta Island, UNESCO World Heritage Site, Mumbai (Bombay), Maharashtra, India, Asia

Caves carved in the stone of the mountain inside, Petra, UNESCO World Heritage Site, Jordan, Middle East

A stream running through the Mossy Cave Trail in Bryce Canyon National Park, Utah, United States of America, North America

Panagia Spiliani, Blessed Virgin Mary of the Cave Monastery, Mandraki, Nisyros Island, Dodecanese, Greek Islands, Greece, Europe

Panagia Spiliani, Blessed Virgin Mary of the Cave Monastery, Mandraki, Nisyros Island, Dodecanese, Greek Islands, Greece, Europe

Dwelling caves (cave dwellings) on the bay of Matala, Iraklion, Crete, Greek Islands, Greece, Europe

View towards the Panagia Spiliani, Blessed Virgin Mary of the Cave Monastery, Mandraki, Nisyros Island, Dodecanese, Greek Islands, Greece, Europe

View towards the Panagia Spiliani, Blessed Virgin Mary of the Cave Monastery, Mandraki, Nisyros Island, Dodecanese, Greek Islands, Greece, Europe

Corridor off which are monks' living quarters, Cave 2 of Buddhist caves in rock-carved stupa-monastery complex dating from the Kushano-Sasanian period, Takht-I-Rustam (Rustam's Throne), near Haibak, Samangan Province, Afghanistan, Asia

Rock paintings of decorated woman and children on cave, Tassili n'Ajjer, UNESCO World Heritage Site, Algeria, North Africa, Africa