Puka Pukara is a site of military ruins in Peru situated in the Cusco Region, Cusco Province, Cusco District, near Cusco. This fort is made of large walls, terraces, and staircases and was part of defense of Cusco in particular and the Inca Empire in general.
The name probably comes from the red color of the rocks at dusk. Puka Pukara is an example of military architecture that also functioned as an administrative center.
More information http://www.rediscovermachupicchu.com/puca-pucara.htm
Coordinates -13°29'0.064" N -71°57'43.777" E