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Son Doong Cave in Vietnam is a spelunking paradise

This recently discovered cave in Vietnam is massive beyond description. An entire forest is growing inside! Son Doong cave, Vietnam

Slovenian Caves - the Grand Canyon of the underground. (Slovenia is a country of caves, with some 8,500 being registered. On average, 100 new caves are discovered each year. Some of the more famous ones are: Križna Cave, Planina Cave, Postojna Cave, Škocjan Caves.)