Hidden in the depths of the Vietnamese jungle lies The Hang Son Doong, part of a network of over 150...

Hidden in the depths of the Vietnamese jungle lies The Hang Son Doong, part of a network of over 150 caves. Surrounded by jungle and used in the Vietnam war as a hideout from American bombardments, the cave passage is so large that it could hold a block of 40-storey skyscrapers.

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