World’s Largest Cave, Son Doong, Prepping For First Public Tours (Video & pics)
The Son Doong Cave in Vietnam is the biggest cave in the world. It’s over 5.5 miles long, has a jungle and river, and could fit a 40-story skyscraper within its walls. But nobody knew any of that until four years ago. A local man discovered the cave entrance in 1991, but British cavers were …
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