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Exploration

Son Doong – Vietnam’s Mammoth Cave

Explore the 2.5-mile Hang Son Doong, or “mountain river cave,” along the Vietnam-Laos border via this animated 3-D flyby.

Photo Essay: Inside Son Doong, the World’s Largest Cave

Only a thousand people have passed through this cave since its discovery. We were lucky enough to be among them. It was 1991. A Vietnamese...
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