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Machu Picchu - Trapezoidal Window looking out to the Agricultural Sector

Machu Picchu - Trapezoidal Window looking out to the Agricultural Sector

There are approximately 200 buildings in Machu Picchu. Most of the buildings are built with blocks of stone that are cut with bronze or stone tools smoothed with sand, and fit together tightly without mortar. This technique called ashlar has been mastered by the Incas that many junctions in the central city are so perfect that it is said not even a blade of grass fits between the stones. Doors and windows bear a trapezoidal shape and tilt inward from bottom to top, with rounded corners and inside corners often inclining slightly into the rooms. "L" shaped blocks are often used to tie outside corners together. All these details in design had helped protect the walls against collapsing in an earthquake.