The Polygonal Wall shown in the image is part of the fortress of Saksaywaman located near Cusco, Peru. Some of the polygonal shaped stones have as many as 12 internal angles. Even with the multi-angle stones, the Inca were able to fit them together perfectly. They learned some of the techniques from the other cultures, such as the Kilke, that existed before them.
The Polygonal Walls get their name from the polygonal shapes of the stones that were used to build the wall. One of the main advantages of the polygonal walls is that they withstand earthquakes very well. Cuzco and the nearby areas are located on a severe earthquake zone, and the Inca structures seem to have withstood earthquakes very well.
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