Sacsayhuamán
Cusco picture - Sacsayhuamán (also known as Saksaq Waman) is a walled complex near the old city of Cusco. 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 all Inca stonework there is still mystery surrounding how they were constructed. Thanks to an as yet unexplained precision in stone-cutting, the structure is built in such a way that a single piece of paper will not fit between two stones.