Vietnam
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They Didn't Even Know This Existed
Son Doong Cave, Vietnam is the biggest cave in the world. It's over 5.5 miles long, has a jungle, a river, and could fit a 40-story skyscraper within. The cave is one of the largest in the world. A local man discovered the cave entrance in 1991, British cavers were the first to explore it in 2009. The local man didn't go in because the entrance he found had too steep a drop.