The US explorers who 'found' a lost, ancient city

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.

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.

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