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A snorkeler explores the fresh water grotto formations at Makatea, Tuamotus, French Polynesia, South Pacific, Pacific

Lake of the Clouds, Carlsbad Caverns National Park, UNESCO World Heritage Site, New Mexico, United States of America, North America

A snorkeler explores the fresh water grotto formations at Makatea, Tuamotus, French Polynesia, South Pacific, Pacific

'Bacon strip' curtain formations at King Solomon's Cave in the Mole Creek Karst National Park, the north, Tasmania, Australia, Pacific

Interior of the Baradla-Domica cave system in the Aggtelek National park which stradles the border between Hungary and Slovakia.

Interior of the Baradla-Domica cave system in the Aggtelek National park which stradles the border between Hungary and Slovakia.

Interior of the Baradla-Domica cave system in the Aggtelek National park which stradles the border between Hungary and Slovakia.

Interior of the Baradla-Domica cave system in the Aggtelek National park which stradles the border between Hungary and Slovakia.

'Bacon strip' curtain formations at King Solomon's Cave in the Mole Creek Karst National Park, the north, Tasmania, Australia, Pacific

Pillar, geological calcareous formation on the wall of Anhumas Abyss, Bonito, Mato Grosso do Sul, Brazil, South America

12/04/2009. United Kingdom, City of Gibraltar, St Michalel's Cave, Upper Rock Nature Reserve. Stalactites and lime scale formations on cave roof. . City Of Gibraltar, St Michalel's Cave, Gibraltar Strait . UK, United Kingdom

12/04/2009. United Kingdom, City of Gibraltar, St Michalel's Cave, Upper Rock Nature Reserve. Stalactites and lime scale formations on cave roof. . City Of Gibraltar, St Michalel's Cave, Gibraltar Strait . UK, United Kingdom

12/04/2009. United Kingdom, City of Gibraltar, St Michalel's Cave, Upper Rock Nature Reserve. Stalactites and lime scale formations on cave roof. . City Of Gibraltar, St Michalel's Cave, Gibraltar Strait . UK, United Kingdom

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.

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.

USA, United States of America, Arizona: Antelope Canyon, bizarre sandstone formation, washed out by water, corkscrew slot canyon on the Navajo Indian Reservation.

Caving in the Wapiabi caves on the Whitegoat Mountain, Blackstone-Recreation-Area, Rocky Mountains, Alberta, Canada

Chang Cave, stalactite or limestone cave in karst rock formations, Vang Vieng, Vientiane, Laos, Indochina, Asia

Marble Caves Sanctuary, Strange rock formations caused by water erosion, General Carrera Lake, Puerto Rio Tranquilo, Aysen Region, Patagonia, Chile, South America

Marble Caves Sanctuary, Strange rock formations caused by water erosion, General Carrera Lake, Puerto Rio Tranquilo, Aysen Region, Patagonia, Chile, South America

Bizarre rock formations of the marble caves, Cuevas de Marmol, Lago General Carrera, Puerto Rio Tranquilo, Región de Aysén, Chile, South America

Black lava beach, basalt cave with basalt rocks, Reynisdrangar near Vík í Mýrdal, Suðurland, Southern Region, Iceland, Europe

Excursion boat cruises through rock arches and caves, rugged rock coast, rock formations in the sea, Algarve, Lagos, Portugal, Europe

A female cave explorer looks into a crystal clear Gour Pool surrounded by delicate Stalactite formations.

A British cave explorer casually admires the highly decorative formations in this particular passage, in Whiterock (cave). Deep

Fascinated by the pretty formations, this cave explorer poses for scale next to a cluster of Stalactites deep in Moon Cave.

Scuba diver swims through lava arches with sun rays, Cathedrals dive site, Lanai City, Lanai, Hawaii, United States of America

A Filipino Tour Guide Holds A Lantern Inside Sumaging Cave Or Big Cave Near Sagada, Luzon, Philippines

A Filipino Tour Guide Holds A Lantern Inside Sumaging Cave Or Big Cave Near Sagada, Luzon, Philippines

A Filipino Tour Guide Holds A Lantern Inside Sumaging Cave Or Big Cave Near Sagada, Luzon Philippines

Travelers entering an ice tunnel while exploring the famous Franz Josef Glacier with its, blue ice caves, deep crevasses and tunnels that mark the ever changing ice formations; West Coast, New Zealand