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Sơn Đoòng Cave was only discovered in 1991 and has the largest known cavern in the world. It has only been open to tourists since 2013 and only small numbers at that. When you consider that this cave was unknown until so recently, it's safe to say there are many more caves in inhospitable parts of the world that have yet to be discovered (or maybe ...


A lot of forest areas in India, south Asia or Africa might be be unexplored. GE can give an aerial view but it is very difficult to determine what is actually going underneath the forestation. These areas might be inhabited too.

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