Sacsayhuamán is an ancient Inca fortress located on the outskirts of Cusco, Peru. Built in the 15th century, it is renowned for its massive stone walls, constructed using large, precisely cut stones that fit together without mortar. The site served both military and religious purposes and is a UNESCO World Heritage Site. The fortress covers a large area and features impressive zigzag walls that provide stunning views of the surrounding landscape. Sacsayhuamán is also significant for its cultural heritage, as it reflects the architectural and engineering skills of the Inca civilization. Today, it attracts many visitors interested in history and archaeology.