Sacsayhuamán, often spelled Saqsaywaman or Xacxaguaman, (possibly from Quechua language, waman falcon or variable hawk), is a citadel on the northern outskirts of the city of Cusco, Peru, the historic capital of the Inca Empire. The site is at an altitude of . The complex was built by the Incas in the 15th century, particularly under Emperor Pachacuti and his successors. Dry stone walls constructed of huge stones were built on the site, with the workers carefully cutting the boulders to fit the…