This Enormous Lake Is Hidden Nearly Two Miles Beneath the Earth’s Surface

Hidden deep beneath the Earth’s surface are vast underground lakes formed within caves and geological basins. In this ...
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Inside Vietnam's Hang Sơn Đoòng: The world's largest cave with its own forest, river, and clouds

Deep inside the remote jungles of central Vietnam lies a hidden world so surreal that it feels like science fiction brought to life. Hang Sơn Đoòng is the world’s largest cave. It's a natural wonder ...