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Deer Cave with show cave path, largest cave passage in the world, Gunung Mulu National Park, Sarawak, island of Borneo, Malaysia
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
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
Cavers shining lamps on bats in Pokhara Bat Caves, Pokhara, Nepal, Asia
Rope Makers' Cave (Grotta dei Cordari), Neapolis Archaeological Park, UNESCO World Heritage Site, Syracuse, Sicily, Italy, Mediterranean, Europe
Rope Makers' Cave (Grotta dei Cordari), Neapolis Archaeological Park, UNESCO World Heritage Site, Syracuse, Sicily, Italy, Mediterranean, Europe
Plan Puitz, Saint Oyen, Valle d'Aosta, Italy, Europe
The Sapphire Ice Cave, Breiamerkurjokull Glacier, Vatnajokull National Park, Iceland, Europe
The gigantic Gruta de Benagil sea cave (Benagil Cathedral), Algarve, Portugal
The gigantic Gruta de Benagil sea cave (Benagil Cathedral), Algarve, Portugal
Cave of Poetry (Grotta della Poesia), Roca Vecchia, Lecce, Salento, Apulia, Italy
Cave of Poetry (Grotta della Poesia), Roca Vecchia, Lecce, Salento, Apulia, Italy
Cave of Poetry (Grotta della Poesia), Roca Vecchia, Lecce, Salento, Apulia, Italy
Cave of Poetry (Grotta della Poesia), Roca Vecchia, Lecce, Salento, Apulia, Italy
Cave of Poetry (Grotta della Poesia), Roca Vecchia, Lecce, Salento, Apulia, Italy
Gravina, Bari, Alta Murgia, Apulia, Italy
The Sanctuary of Pla de Petracos, site of Neolithic rock paintings, near Castell de Castells, Marina Alta, Alicante province, Spain, Europe
Statue of St. Michael the Archangel, Sanctuary of St. Michael the Archangel, Monte Sant'Angelo, UNESCO, Foggia, Apulia, Italy
Waterfall from Slate Cavern Tunnel entrance, Dinorwig Quarry (Dinorwic Quarry), Eryri (Snowdonia National Park), North Wales, United Kingdom
Postojna Cave, near Postojna, southwestern Slovenia, Europe
Postojna Cave, near Postojna, southwestern Slovenia, Europe
Postojna Cave, near Postojna, southwestern Slovenia, Europe
Laas Geel caves with prehistoric paintings, Somaliland, Somalia, Africa
View from inside ice cave under the Vatnajokull Glacier with person for scale, near Jokulsarlon Lagoon, South Iceland, Polar Regions
Tam Thanh cave, Lang Son, Vietnam, Indochina, Southeast Asia, Asia
Mer de Glace Glacier Ice Cave, Mont Blanc Massif, Chamonix, Haute-Savoie, French Alps, France, Europe
Mer de Glace Glacier Ice Cave, Mont Blanc Massif, Chamonix, Haute-Savoie, French Alps, France, Europe
Sperlinga Castle, Sperlinga, Enna, Sicily, Italy, Mediterranean, Europe
Cave of Poetry (Grotta della Poesia), Roca Vecchia, Lecce, Salento, Apulia, Italy
Cave of Poetry (Grotta della Poesia), Roca Vecchia, Lecce, Salento, Apulia, Italy
Gravina, Bari, Alta Murgia, Apulia, Italy
Divers preparing for dive in the grotto collapsed cave on Saipan, Northern Marianas, Central Pacific, Pacific
Cueva del Milodon, Puerto Natales, Patagonia, Chile, South America
Tourist exploring an ice cave on Breidamerkurjokull Glacier, Vatnajokull Ice Cap, Iceland, Polar Regions
Tourists exploring Waitomo Caves, Waikato Region, North Island, New Zealand, Pacific
Tourist in Waitomo Caves, Waikato Region, North Island, New Zealand, Pacific
Talava Arches, Niue, South Pacific, Pacific
Monks' cells cut into the hillside rock among the Udayagiri and Khandagiri caves dating back to over 100 years BCE sculpted as religious retreats for Jain devotees, Bhubaneswar, Odisha, India, Asia
Monks' cells cut into the hillside rock among the Udayagiri and Khandagiri caves dating back to over 100 years BCE sculpted as religious retreats for Jain devotees, Bhubaneswar, Odisha, India, Asia
Monks' cells cut into the hillside rock among the Udayagiri and Khandagiri caves dating back to over 100 years BCE sculpted as religious retreats for Jain devotees, Bhubaneswar, Odisha, India, Asia
Monks' cells cut into the hillside rock among the Udayagiri and Khandagiri caves dating back to over 100 years BCE sculpted as religious retreats for Jain devotees, Bhubaneswar, Odisha, India, Asia
A climber is lowered from a the edge of a huge cave in the Mascun Gorge, near Rodellar, Sierra de Guara mountains, northern Spain, 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.
View of tidewater glacier cave found deep inside Neko Harbor on the western side of the Antarctic Peninsula, Polar Regions
View through cave entrance across the clear turquoise waters of Cala Corsara to the pink granite headland of Punta Rossa Corsara, Spargi Island, La Maddalena Archipelago National Park, Sassari, Sardinia, Italy, Mediterranean, Europe
Main altar in the new Salt Cathedral of Zipaquira, Cundinamarca department, Savannah of Bogota, Colombia, South America
Cave dwelling among euphorbia, La Palma, Canary Islands, Spain, Atlantic Ocean, Europe
Entrance to the Santo Tomas cave complex in the Vinales National Park, UNESCO World Heritage Site, Pinar del Rio, Cuba, West Indies, Caribbean, Central America
Looking down into the Los Peces fresh water cave near Playa Giron, Matanzas Province, Cuba, West Indies, Caribbean, Central America
Cave dwellings in Pigeon Valley, Uchisar, Cappadocia, Anatolia, Turkey, Asia Minor, Asia
Sapphire Ice Cave, Breithamerkurjokull glacier, Vatnajokull National Park, Iceland, Europe
Blue ice inside iceberg, Antarctica, Polar Regions
A diver shines a light in on a cavern filled with glassy sweepers (Pempheris schomburgkii) at Molasses Reef in Key Largo, Florida.
School of silversides form shapes in the tunnels at Eden Rock, Grand Cayman.
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 scuba diver swims through an underwater field of tape grass leading away from the Blue Springs cave in Merritts Mill Pond in Marianna, Florida.
A scuba diver surfacing and looking up into the light as he ascends from the bottom of Devil's Den, a sinkhole in Williston, Florda.
A technical cave diver using a diver propulsion vehicle (DPV) to dive into the Blue Springs state park cave system near Marianna, Florida.
A scuba diver ascends into the light emanating above through the sink hole into the clear freshwaters of Devil's Den cave near Williston, Florida.
Underwater photographer at the entrance of a cave framed by pink barrel sponges, North Sulawesi, Indonesia.
Cave exit with three divers, Grotta dei Cirri, Ustica, Italy.
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.
A cavern diver ascends into the light filtering into cenote system at Yucatan Peninsula, Mexico.
Two scuba divers in the Garden of Eden cavern part of the cenote system on the Yucatan Peninsula of Mexico.
Cenote diver enters Taj mahal cavern on Yucatan peninsula in Mexico.
A cavern diver enters the Taj Mahal cenote system on Mexico's Yucatan Peninsula.
Cavern divers enter cenote system in Mexico's Yucatan Peninsula.
Scuba diver in the Garden of Eden cavern part of the cenote system on the Yucatan Peninsula of Mexico.
A cliff cave below Crystal Mesa west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America
Castellana caves (Castellana Grotte), Apulia, Italy, Europe
Postojna Caves, Postojna, Slovenia, Eastern Europe
Postojna Caves, Postojna, Slovenia, Eastern Europe
Postojna Caves, Postojna, Slovenia, Eastern Europe
Copper mines in the former French mining town of Santa Rosalia, Baja California Sur, Mexico, North America
Sea cave in the King Leopold sandstone formations, Hunter River, Frederick Harbor, Kimberley, Western Australia, Australia, Pacific
Cave of Papafragas, Milos, Cyclades, Greek Islands, Greece
Cave of Papafragas, Milos, Cyclades, Greek Islands, Greece
Cave of Papafragas, Milos, Cyclades, Greek Islands, Greece
Cave of Elafonisos island with orange rock color painted in white, Greece
Cave of Elafonisos island with orange rock color painted in white, Greece
Cave of Elafonisos island with orange rock color painted in white, Greece
Cave of Elafonisos island with orange rock color painted in white, Greece
Cave of Elafonisos island with orange rock color painted in white, Greece
Henjo Cave Daishoin Temple, Hiroshima, Japan.
Cenote Oxman, Valladolid, Yucatan State, Mexico
Cenote Oxman, Valladolid, Yucatan State, Mexico
Cenote Samula, Dzitnup near Valladolid, Yucatan State, Mexico
Cenote Samula, Dzitnup near Valladolid, Yucatan State, Mexico
Cenote Samula, Dzitnup near Valladolid, Yucatan State, Mexico
Cenote Saamal, Valladolid, Yucatan State, Mexico
Cenote Oxman, Valladolid, Yucatan State, Mexico
Cenote Oxman, Valladolid, Yucatan State, Mexico
Cenote Xkeken, Dzitnup near Valladolid, Yucatan State, Mexico
Cenote Xkeken, Dzitnup near Valladolid, Yucatan State, Mexico
Entrance to the Cenote Samula, Dzitnup near Valladolid, Yucatan State, Mexico
Cenote Zaci, Valladolid, Yucatan State, Mexico
Cenote Xkeken, Dzitnup near Valladolid, Yucatan State, Mexico