Sacsayhuaman , Peru
Sacsayhuamán (also known as Saksaq Waman) is a walled complex near the old city of Cusco, in Peru. Some believe the walls were a form of fortification, while others believe it was only used to form the head of the Puma that Sacsayhuamán along with Cuzco form when seen from above. Like much Inca stonework, there is still mystery surrounding how they were constructed. The structure is built in such a way that a single piece of paper will not fit between many of the stones. This precision, combined with the rounded corners of the limestone blocks, the variety of their interlocking shapes, and the way the walls lean inward, is thought to have helped the ruins survive devastating earthquakes in Cuzco.