Sacsayhuamán (also known as Saksaq Waman, Sacsahuaman or Saxahuaman) is a walled complex near Cusco, the former capital of the Inca empire. The site, at an altitude of 3701 m, was added to the UNESCO World Heritage List in 1983.
The Sacsahuamar Site consists of three zigzagging stone walls – as you can see from the photograph, the stones are odd shapes and sizes and fit together like a jig-saw puzzle. Many of the stones have been broken down and plundered over the years – only part of the original structure remains intact.
The largest of the stone blocks in this ancient fortress weighs between 150 tons and 360 tons. The stones were hewn from quarries several miles away from the site. The stones would have had to be lowered into a canyon, taken across a river and then up the side of cliff faces prior to being placed into their final position.
The stones fit together so exactly that not even a blade of grass could slide between them. The builders attributed with the construction were the Quechua in around 1508.