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View of monastic dwellings in caves (troglodyte dwelling) at Goreme Open Air Museum, Goreme, Cappadocia, Turkey, Europe
Deer Cave with show cave path, largest cave passage in the world, Gunung Mulu National Park, Sarawak, island of Borneo, Malaysia
Longboats moored in creek amid rain forest, while tourists visit Clearwater Cave, Mulu National Park, Sarawak, island of Borneo, Malaysia
Rock drawings of Thamudic origin, relating to ancient tribe of Thamud, 3rd century BC to 2nd century AD, in canyon of Jebel Khazali, south of Rum village, Wadi Rum, Jordan
Babur's Alcove, Kandahar, Afghanistan
Panoramic view of the town of Uchisar with its old houses and ancient cave dwellings in the volcanic tufa, Cappadocia, Anatolia, Turkey, Asia Minor, Asia
Panoramic view of ancient cave dwellings in the volcanic tufa formations, Uchisar, Cappadocia, Anatolia, Turkey, Asia Minor, Asia
The Ellora Caves, temples cut into solid rock, near Aurangabad, Maharashtra, India
Polar Bear with cubs, (Ursus maritimus), Churchill, Manitoba, Canada
Upper Antelope, a slot canyon, Arizona, United States of America (U.S.A.), North America
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
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
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
Volcanic cone with plume of smoke of Mount Mayon, 2462m, and grotto or wayside shrine, Bicol Province, Luzon Island, Philippines, Southeast Asia, Asia
Temple building at Wulong Natural Rock Bridges, UNESCO World Heritage Site, Chongqing Municipality, China, Asia
Icicles formed on the roof of caves at Olkhon Island as the waves enter the cave and freeze at the beginning of winter, Lake Baikal, Irkutsk Oblast, Siberia, Russia, Eurasia
Glow worms in Waitomo Caves, Waikato Region, North Island, New Zealand, Pacific
Glow worms in Waitomo Caves, Waikato Region, North Island, New Zealand, Pacific
Glow worms in Waitomo Caves, Waikato Region, North Island, New Zealand, Pacific
Carlsbad Caverns, The Big Room, UNESCO World Heritage Site, Carlsbad, New Mexico, United States of America, North America
Limestone cave interior with many stalactites and stalagmites, Drach caves (Cuevas del Drach), Porto Cristo, Mallorca, Balearic Islands, Spain, Mediterranean, Europe
Ornate columns formed by many hanging stalactites and rising stalagmites coalescing, Drach caves (Cuevas del Drach), Mallorca, Balearic Islands, Spain, Mediterranean, Europe
Dragon-shaped rock lit by late afternoon sun, winter, Mossy Cave Trail, Bryce Canyon National Park, Utah, USA
Columnar basalt lava with Fingal's Cave cut into it by sea, Staffa, off west coast of Mull, Inner Hebrides, Scotland, United Kingdom, Europe
Two blacktail prairie dog (Cynomys ludovicianus) sharing something to eat, Wind Cave National Park, South Dakota, United States of America, North America
Uchisar, Cappadocia, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Eurasia
Temple building at Wulong Natural Rock Bridges, UNESCO World Heritage Site, Chongqing Municipality, China, Asia
Polar Bear with cubs, Ursus maritimus, Churchill, Manitoba, Canada
Woman standing in an ice cave, Fox Glacier, Westland Tai Poutini National Park, South Island, New Zealand, Pacific
Close-up of plant, Cueva de Los Verdes, cave tourist attraction in lava pipe tunnel, Lanzarote, Canary Islands, Spain, Atlantic, Europe
Sacred Cenote, Mayan ruins, Chichen Itza, UNESCO World Heritage Site, Yucatan, Mexico, North America
Woman walking steps out of a ice cave in Fox Glacier, Westland Tai Poutini National Park, South Island, New Zealand, Pacific
Dragon-shaped rock lit by late afternoon sun, winter, Mossy Cave Trail, Bryce Canyon National Park, Utah, USA
Cave entrance, Mount Autana (Cerro Autana), Tepuis, Amazonas territory, Venezuela, South America
Peveril Castle and Cave Dale backed by Mam Tor, Castleton, Peak District National Park, Derbyshire, England, United Kingdom, Europe
Environmental information poster about ecosystem of limestone cenotes, Yucatan, Mexico, North America
Excursion boat to the caves at Ponte da Piedade near Lagos, Algarve, Portugal, Europe
The Sanctuary of Pla de Petracos, site of Neolithic rock paintings, near Castell de Castells, Marina Alta, Alicante province, Spain, Europe
Flooded limestone cave interior with many stalactites and stalagmites and reflections, Drach caves (Cuevas del Drach), Mallorca, Balearic Islands, Spain, Mediterranean, Europe
Two blacktail prairie dog (Cynomys ludovicianus) eating, Wind Cave National Park, South Dakota, United States of America, North America
Tourist framed in the frozen mouth of ice cave, with icicles formed on roof of caves at Olkhon Island as the waves freeze in winter, Lake Baikal, Irkutsk Oblast, Siberia, Russia, Eurasia
Raufarholsheillir lava tube cave system, Iceland, Polar Regions
The Blue Grotto natural sea arch and cliffs, Wied iz-Zurrieq, Malta, Mediterranean, Europe
Tourists walking in the ice grotto inside Rhone Glacier, Gletsch, Canton of Valais, Switzerland, Europe
Torghatten granite mountain with a hole through it, Torget island, Bronnoy, Nordland county, Norway, Scandinavia, Europe
Uchisar, Cappadocia, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Eurasia
Carlsbad Caverns, The Big Room, UNESCO World Heritage Site, Carlsbad, New Mexico, United States of America, North America
War Remembrance Monument, Cave-Penney Memorial Cross 1918, Corndon Down, Cherwell, Dartmoor, Devon, England, United Kingdom, Europe
Cliff top footpath at Ajuy, Fuerteventura, Canary Islands, Spain, Atlantic, Europe
Black sand beach at Ajuy, Fuerteventura, Canary Islands, Spain, Atlantic, Europe
Lush green landscape with rocky cliffs and a clear blue sky, featuring a natural cave entrance and footpath at Malham Cove, Yorkshire, England, United Kingdom, Europe
Water Lilies in Car Wash Cenote Aktun Ha, Tulum, Yucatan, Mexico
Water Lilies in Car Wash Cenote Aktun Ha, Tulum, Yucatan, Mexico
Tourist framed in the frozen mouth of ice cave, with icicles formed on roof of caves at Olkhon Island as the waves freeze in winter, Lake Baikal, Irkutsk Oblast, Siberia, Russia, Eurasia
Ice cave beneath a glacier, Iceland, Polar Regions
Diving in Car Wash Cenote Aktun Ha, Tulum, Yucatan, Mexico
Man standing in an ice cave, Fox Glacier, Westland Tai Poutini National Park, South Island, New Zealand, Pacific
The village of Skocjan, sitting above the famous caves of Skocjanske jame, UNESCO World Heritage Site, Goriska, Slovenia, Europe
Soft Corals in Overhang, Chironephthya sp., Felidhu Atoll, Maldives
Water Lilies in Car Wash Cenote Aktun Ha, Tulum, Yucatan, Mexico
Diving in Car Wash Cenote Aktun Ha, Tulum, Yucatan, Mexico
Diving in Car Wash Cenote Aktun Ha, Tulum, Yucatan, Mexico
Tourist on viewing platform, Aiguille du Midi, Chamonix-Mont-Blanc, French Alps, France, Europe
Swim through, Dominica, West Indies, Caribbean, Central America
Crab Larvae in Indian Ocean, Underwater Cave, Gecarcoidea natalis, Christmas Island, Australia
Crab Larvae in Indian Ocean, Underwater Cave, Gecarcoidea natalis, Christmas Island, Australia
Scuba Diver explores Cave, North Male Atoll, Maldives
Water Lilies in Car Wash Cenote Aktun Ha, Tulum, Yucatan, Mexico
Desert cottontail (Sylvilagus auduboni), Wind Cave National Park, South Dakota, United States of America, North America
Scuba Diving in Bat Caves, Russell Islands, Solomon Islands
Water Lilies in Car Wash Cenote Aktun Ha, Tulum, Yucatan, Mexico
Scuba Diver explores Cave, North Male Atoll, Maldives
Water Lilies in Car Wash Cenote Aktun Ha, Tulum, Yucatan, Mexico
Cueva del Milodon, Puerto Natales, Patagonia, Chile, South America
Scuba Diving in Mbuco Caves, Marovo Lagoon, Solomon Islands
Cave coral (Tubastrea sp.) (Dendrophyllidae) polyps extended and feeding at night, Queensland, Australia, Pacific
Crab Larvae in Indian Ocean, Underwater Cave, Gecarcoidea natalis, Christmas Island, Australia
Water Lilies in Car Wash Cenote Aktun Ha, Tulum, Yucatan, Mexico
Scuba Diver explores Cave, North Male Atoll, Maldives
Water Lilies in Car Wash Cenote Aktun Ha, Tulum, Yucatan, Mexico
Cave system in the Virunga National Park, Rwanda, Africa
Cave, Mount Autana (Cerro Autana), Amazonas territory, Tepuis, Venezuela, South America
Scuba Diving in Custom Caves, Russell Islands, Solomon Islands
Scuba Diving in Bat Caves, Russell Islands, Solomon Islands
Scuba diver in Cave, Raja Ampat, West Papua, Indonesia
Scuba Diver explores Cave, North Male Atoll, Maldives
Scuba Diver explores Cave, North Male Atoll, Maldives
Scuba Diving in Mbuco Caves, Marovo Lagoon, Solomon Islands
Water Lilies in Car Wash Cenote Aktun Ha, Tulum, Yucatan, Mexico
Ajanta Cave complex, Buddhist Temples carved into solid rock dating from the 5th Century BC, Ajanta, Maharastra, India
Woman standing in an Ice cave in the Fox Glacier, Westland Tai Poutini National Park, South Island, New Zealand, Pacific
Woman standing in an ice cave, Fox Glacier, Westland Tai Poutini National Park, South Island, New Zealand, Pacific
Echidna Chasm, Purnululu National Park, UNESCO World Heritage Site, Bungle Bungle Mountain Range, Western Australia, Australia, Pacific
Cave as an entrance to the beautiful Cathedral Cove, Coromandel, North Island, New Zealand, Pacific
View from top of Tiger Cave Temple (Wat Tham Suea), Krabi Province, Thailand, Southeast Asia, Asia
Scuba Diving in Custom Caves, Russell Islands, Solomon Islands
Scuba Diver explores Cave, North Male Atoll, Maldives
Echidna Chasm, Purnululu National Park, UNESCO World Heritage Site, Bungle Bungle Mountain Range, Western Australia, Australia, Pacific
Swim through, Dominica, West Indies, Caribbean, Central America