Zig-zag marks at Sacsayhuaman, Peru baffle experts. Their purpose and creation method are still a mystery. Were advanced tools used? The monumental fortress of Sacsayhuamán, built during the peak of the Inca Empire in the 15th century, is a marvel of ancient engineering. The construction involved quarrying and moving enormous stones, some weighing as much as 200 tons, and shaping them into complex, interlocking patterns. This technique, known as polygonal masonry, created walls so precise that n