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Vietnam's 'Lost World'

Vietnam's 'Lost World'

Home to a vast array of spectacular caverns, Vietnam now boasts the world's largest cave passage, dubbed 'Hang Son Doong.' It is so massive that a block of 40-story buildings or a Boeing 747 could easily fit inside and an arduous five day trek into the cave only allows explorers to investigate half of the enormous subterranean world. An in-depth look at Hang Son Doong can be found at National Geographic.

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