in 1942 a British mountain scout stumbled upon a lake over 16,000 feet in elevation high in the Himalaya Mountains in far north India. The lake contained the bones of around 500 individuals later determined to have died around 850 CE for most of them. Why were they there and what could have caused their deaths in such a remote venue?
https://www.theatlantic.com/science/...n-lake/596416/
https://en.m.wikipedia.org/wiki/Roopkund