Travel Adventure - The Son Doong Cave in Vietnam is the biggest cave in the world. It's over 5.5 miles long, has a jungle & river, could fit a 40-story skyscraper within its walls.
But nobody knew any of that until 6 years ago Though A local man discovered the cave entrance in 1991, but British cavers were the first to explore it in 2009.
But nobody knew any of that until 6 years ago Though A local man discovered the cave entrance in 1991, but British cavers were the first to explore it in 2009.
Wonderful place in the Vietnam
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