Archaeological Mystery: 10,000 or More Caves were Dug into the Himalayas Over 2,000 Years Ago

ancientorigins:

At least 2000 years ago courageous individuals were scaling the Himalayas to create caves. Much mystery surrounds why they made the structures in such a perilous place and who built them. But a few interesting details have come to light over the years of research…

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