Hang Son Doong: The world’s biggest cave, so ‘outrageous in size’ it fits 2 jungles and the ‘Great Wall of Vietnam’
Hang Son Doong extends more than 3 miles(5 km )long and 660 feet(200 m)high. (Image credit: Geng Xu/Getty Images) FAST FACTS Call: Hang Son Doong Place: Quang Binh Province, Vietnam…
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