Crystal Caves, Bermuda. Lake underneath a cave - you can see to the bottom the water is so clear.

Crystal Caves, Bermuda. Lake underneath a cave - you can see to the bottom the water is so clear.

mexico's cave of giant crystals. outstanding. PBS did a special on these crystals. They are huge.

mexico's cave of giant crystals. outstanding. PBS did a special on these crystals. They are huge.

Crystal Cave Mexico share on facebook | The Giant Crystal Cave in Mexico under Naica Mountain.

The Giant Crystal Cave in Mexico under Naica Mountain.

Crystal Cave Mexico share on facebook | The Giant Crystal Cave in Mexico under Naica Mountain.

Cave of Crystals, Naica, Chihuahua, Mexico

15 Most Popular Underground Caves in the World

101 Most Beautiful Places To Visit Before You Die! (Part I)

101 Most Beautiful Places To Visit Before You Die! (Part I)

Lu Di Yan, The Reed Flute Cave is a landmark and tourist attraction in Guilin, Guangxi, China St.Michael's Cave, is a cave system in the British Overseas Territory of Gibraltar Crystal Cave - Svínafellsjökull in Skaftafell, Iceland The Cave...

Crystal Cave is a marble cave in Sequoia National Park, in California. It is between the Ash Mountain entrance of the park and Giant Forest

Crystal Cave is a marble cave in Sequoia National Park, in California. It is between the Ash Mountain entrance of the park and Giant Forest

Crystal Cave, Sequoia National Park, California. This marble cave in the Giant Forest region is between the Ash Mountain entrance of the park and Giant Forest. The cave is a constant 9 °C (48 °F), and only accessible by guided tour. Photographer unknown.

Crystal Cave, Sequoia National Park, California. This marble cave in the Giant Forest region is between the Ash Mountain entrance of the park and Giant Forest. The cave is a constant 9 °C (48 °F), and only accessible by guided tour. Photographer unknown.

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