Set high upon the crest of a mountain ridge above Peru's Sacred Valley lies the fabled 15th Century Inca citadel Machu Picchu.
View moreThe Machu Picchu archaeological site lies in a saddle between the peaks of Machu Picchu (the mountain) and Huayna Picchu.
View moreThey can use the Internet to spread lies or stolen secrets or dangerously bad advice.
View moreBecause the city basically lies in swamp, the builders of the city had to dig canals to use the digging ground for getting the living ground higher.
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