BOLIVIA: The Hidden World Above the Andes Few Ever See | 4K Travel Documentary

At altitudes where your lungs would constrict from lack of oxygen, where the soil refuses to support any life, ancient civilizations accomplished what should have been impossible.
They built colossal cities, intricate canals, and left behind structures that modern engineers still can't decipher.
Why did they choose this harsh place to start an empire?
Is Bolivia a nation... or, in essence, a museum of surreal things kept hidden from the world for millennia?