Sacsayhuamán (also known as Saksaq Waman, Sacsahuaman) is a walled complex near Cusco, the former capital of the Inca empire.
The site, at an altitude of 3,701 metres (12,142 ft), was added to the UNESCO World Heritage List in 1983.
Because of its location high above Cuzco and its immense terrace walls, this area of Sacsayhuaman is frequently referred to as a fortress.
The stones used in the construction of these terraces are among the largest used in any building in prehispanic America and display a precision of fitting that is unmatched in the Americas. The stones are so closely spaced that a single piece of paper will not fit between many of the stones. This precision, combined with the rounded corners of the 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.