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NARRATOR: High in the Peruvian Andes, there's an ancient city called Machu Picchu. It is a ruin that defies explanation. Who were the mysterious people who built it and why did they build it here?

You have reached your maximum number of saved items. Remove items from your saved list to add more. Like many other world-famous places, the Machu Picchu experience is widely documented. If I’d looked ...