7 thoughts on “PHOTO: Steep Mountains and a Deep River Gorge Made Machu Picchu Inca Ruins Virtually Impenetrable”

  1. I’m wondering what was the reason they built it all the way up here – it may have been impenetrable but difficult to live here too!

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    • Hi Heather: Actually, I think they had it pretty good up there. They had a reliable, secure source of water, great climate for growing stuff, etc. And they were totally safe from attack, not to mention one of the greatest views in the world.

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