Just outside the city of Cusco stands an Inca complex of huge walls and vast boulders, which fit as if nature had fashioned them. It consists of three tiered walls zigzagging towards a tower, interrupted by great doorways.
Built in the 15th century over 70 years, with a labor force of 20,000, it is a masterly feat of Inca construction. Pizarro’s forces took the fort in 1536 after weeks of seige.
Sacsayhuamán, which can be spelled many different ways, is a citadel on the northern outskirts of the city of Cusco, Peru, the historic capital of the Inca Empire. The complex was built by the Inca in the 15th century, particularly under Pachacuti and successors. They built dry stone walls constructed of huge stones. Address: Cusco 08002, Peru Wikipedia