Mysterious Monuments and Places That Have Baffled Scientists

Mysterious Monuments and Places That Have Baffled Scientists
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 Machu Picchu, Peru

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 One of the most stunningly beautiful ancient cities, Machu Picchu presents some difficult questions. How was the massive amount of stone hauled up the steep mountainside prior to the advent of heavy machinery? What about the extraordinary architecture of the hillside temple above Machu Picchu?

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