Son Doong, the world’s largest cave passage — big enough to fit a skyscraper — is deep inside a Vietnamese jungle. Exploring the dark caverns, home to beautiful rock formations and a river, takes days.
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Son Doong, the world’s largest cave passage — big enough to fit a skyscraper — is deep inside a Vietnamese jungle. Exploring the dark caverns, home to beautiful rock formations and a river, takes days.
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