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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.
Melissani Cave, Kefalonia, Greece >>> It's like looking at a fairytale...wow.
Reed Flute Cave, China - 50 Of The Most Beautiful Places in the World (Part 5)