A man stumbled on Vietnam’s Son Doong, the world’s largest cave passage. It took him years to find it again.

A man stumbled on Vietnam’s Son Doong, the world’s largest cave passage. It took him years to find it again.

Vietnam’s Son Doong is sufficiently big to match a skyscraper, however regardless of its immense measurement, it took 18 years for Ho Khanh, the man who first discovered the entrance, to rediscover Hang Son Doong, deep inside a Vietnamese jungle.  In 2009, Peter MacNab, together with a five-man group, have been the first to discover…

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