Vietnam's Son Doong Cave, Home to Its Own Jungle, Was Found by a Local in 1990
Son Doong Cave in Vietnam is a vast underground world beneath ancient limestone terrain. A local man, Ho Khanh, first came across it in 1990. The cave was not fully mapped until 2009, when its giant rock formations and a river carved over millions of years were documented. Since 2013, guided tours have let visitors see its fragile ecosystem while supporting sustainable tourism.
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