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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

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

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

Flooded limestone cave interior with many stalactites and stalagmites and reflections, Drach caves (Cuevas del Drach), Mallorca, Balearic Islands, Spain, Mediterranean, Europe

Carlsbad Caverns, The Big Room, UNESCO World Heritage Site, Carlsbad, New Mexico, United States of America, North America

The natural show of Frasassi Caves with sharp stalactites and stalagmites, Genga, Province of Ancona, Marche, Italy, Europe

The natural show of Frasassi Caves with sharp stalactites and stalagmites, Genga, Province of Ancona, Marche, Italy, Europe

View from cave to rainforest, Tiger Cave Temple (Wat Tham Suea), Krabi Province, Thailand, Southeast Asia, Asia

Cueva del Indio (Indian Cave), Vinales, UNESCO World Heritage Site, Pinar del Rio Province, Cuba, West Indies, Central America

Furong stalactite cave of the Wulong Karst geological park, UNESCO World Heritage Site in Wulong county, Chongqing, China, Asia

Colourful Paradise cave, Phong Nha-Ke Bang National Park, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia

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

Cueva del Indio (Indian Cave), Vinales, UNESCO World Heritage Site, Pinar del Rio Province, Cuba, West Indies, Central America

Colourful Paradise cave, Phong Nha-Ke Bang National Park, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia

Colourful Paradise cave, Phong Nha-Ke Bang National Park, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia

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

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

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

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

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 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

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

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

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

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

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

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

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

Stalactites and stalagmites, Drach caves, Porto Christo, Mallorca, Balearic Islands, Spain, Mediterranean, Europe

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

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.

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.

Venus Grotto of King Ludwig II, artificial stalactite cave with a lake and a shell-shaped boat, painting "Tannhäuser bei Frau Venus" by August von Heckel, palace gardens of Linderhof Palace, Upper Bavaria, Bavaria, Germany, Europe

Gruta de las Maravillas, lake in a cave, stalactites and stalagmites in a dripstone cave, Aracena, Huelva, Andalusia, Spain, Europe

Gruta de las Maravillas, lake in a cave, stalactites and stalagmites in a dripstone cave, Aracena, Huelva, Andalusia, Spain, Europe

Colourful illumination in the largest stalactite cave of Guilin, the Reed Flute Cave, Guilin, Guangxi, China, Asia

Colourfully, illuminated Hang Sung Sot cave, Surprise Cave, Cave of Awe, a UNESCO World Heritage Site, stalactite cave in Halong Bay, Vietnam, Southeast Asia, Asia

Meramec Caverns with brightly illuminated limestone structures in the so called Movie Theatre, Missouri, USA

Varied lighting in the largest stalactite cave of Guilin, the Reed Flute Cave, Guilin, Guangxi, China, Asia

Meramec Caverns with limestone structures such as stalagmites and stalactites on the Meramec River, Missouri, USA

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