In 1556, the great city of Cusco was destroyed by the Spanish who shot flaming projectiles into all of the buildings, walls, marketplaces, temples, and more. This decision came supposedly from the Manco Inca, a puppet ruler put in place by the Spanish controlling force. This process of destruction allowed the Spaniards to rebuild everything in their own style. They used the blocks and other stones to create government buildings, churches, expensive homes, and more.
The unique zigzag wall and other remaining structures once part of Sacsayhuaman make up only a small part of the entire area. As archaeologists returned again and again to study the Inca and pre-Inca buildings and artefacts, they found that the entire region was over 100 hectares in length and width. Most of the area is currently hidden under the forests that have grown up since those early days. However, a bird's eye view of the region shows that the ancient people terraced the entire hilltop. They estimate that, at one time, the entire hill must have held walls and other construction projects that they hope to unearth one day. They may even find more gargantuan megalithic stones and walls with unique architectural style.
Jesus Gamarra and his father Alfredo studied Cusco and the Sacred Valley for decades. They both became experts in the study of megalithic architecture and the unique styles and building abilities practiced in that region. Jesus surmises that the terrorist hilltop was once a type of quasi-natural pyramid shaped by people who predated the Inca. Sacsayhuaman stood at the pinnacle of this pyramid as a place of importance power and religious use.