When the Incas built Machu Picchu they shaped the stones of the buildings so exact that to this day you can't fit a thin knife between the stones. The stones aren't staying together because of mortar but because of pure craftsmanship.
The homes were shaped like a pentagonal prism. The strange thing about the building in Machu Picchu is they were built without roofs. Some of the buildings were built in a rectangular prism shapes. The doors of most of the buildings were trapezoid shaped. The only buildings with roofs were the homes that were on the outside of Machu Picchu, they were very small huts, and the Sapa Inca's temples.
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