In 1911, a US professor claimed he found the secret mountain stronghold of the last Incan king. 53 years later, a new explorer proved him wrong – and the BBC followed in his footsteps.
Morning Overview on MSN
The stones at Bolivia’s Puma Punku are cut so precisely they look machined by hand
High on the Bolivian altiplano sit blocks of stone so cleanly cut that visitors routinely assume a machine shaped them. The ...
Early farmers achieved an "engineering wonder of the world" by building a giant irrigation system in South America thousands ...
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