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美しい地下世界 レチュギア洞窟の写真と動画 - 地球はすごい!明日の地球 自然 動物 風景の動画や写真

tomorrowearth.com

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Things to do in Kentucky

Mammoth Cave in Kentucky, USA. World's largest cave system. Over 390 miles of passageways.

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Reed Flute Cave Guanxi or Guilin, China The cave contains an overwhelming abundance of speleothems lighted in a typical Chinese manner with colored lights. http://www.travelguilinguide.com/sight/guilin/8.html

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