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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 is the world's largest known cave, with enough space in some of its passages to fly a Boeing 747 airplane ...
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Inside the world's largest cave in Vietnam
Take an otherworldly journey through Hang Son Doong, the world's largest cave located in Vietnam. The cave is more than 500 feet tall, 650 feet wide, and 29,500 feet long. Video courtesy of Ryan ...