Saksaywaman is a citadel on the northern outskirts of the city of Cusco, Peru, the historic capital of the Inca Empire. Sections were first built by the Killke culture about 1100; they had occupied the area since 900. The complex was expanded and added to by the Inca from the 13th century; they built dry stone walls constructed of huge stones. The workers carefully cut the boulders to fit them together tightly without mortar. The site is at an altitude of 3,701 m (12,142 ft). Located on a steep hill that overlooks the city, the fortified complex has a wide view of the valley to the southeast. Archeological studies of surface collections of pottery at Saksaywaman indicate that the earliest occupation of the hilltop dates to about 900 CE

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