This site is located north of the city of Cusco, at an altitude of about 3555 meters above sea level, between the districts of Cusco and San Sebastian, both of them within in the province and department of Cusco. The archaeological park covers an area of 3094 Hectares and contains more than 200 archaeological sites.

When the Spanish conquerors arrived first to these lands, they could not explain themselves how Peruvian "Indians" (ignorant, wild, without any ability of logical reasoning, one more animal species according to conquerors) could have built such a greatness. Their religious fanaticism led them to believe that all that was simply work of demons or malign spirits. Still today, many people believe in the inability of ancient Quechuas to create such a wonder, so they suggest that they were made by beings of some other worlds, extraterrestrial beings with superior technology that made all that possible. However, the history and archaeology demonstrate that those objects of admiration are an undeniable work of the Incas, Quechuas, Andean people or however pre-Hispanic inhabitants of this corner of the world would be named.

The imperial city Cusco, meaning "navel of the earth", was laid out in the form of a puma, the animal that symbolized the Inca dynasty. The belly of the puma was the main plaza, the river Tullumayo formed its spine, and the hill of Sacsayhuaman its head.

One of the most imposing architectonic complexes inherited from the Incan Society is Sacsayhuaman, which because of several of its qualities is considered as one of the best monuments that mankind built on the earth's surface.

The stones fit so perfectly that no blade of grass or steel can slide between them. There is no mortar. They often join in complex and irregular surfaces that would appear to be a nightmare for the stonemason. Scientists speculate that the masonry process might have worked like this: after carving the desired shape out of the first boulder and fitting it in place, the masons would somehow suspend the second boulder on scaffolding next to the first one. They would then have to trace out a pattern on the second boulder in order to plan the appropriate jigsaw shape that would fit the two together. In order to make a precise copy of the first boulder's edges, the masons might have used a straight stick with a hanging plum- bob to trace its edges and mark off exact points for carving on the second boulder. After tracing out the pattern, they would sculpt the stone into shape, pounding it with hand-sized stones to get the general shape before using finger-size stones for precision sanding. Admittedly, this entire technique is merely scientific speculation. The method might have worked in practice but that doesn't mean this is how the ancient Quechua stonemasons did it.

There is usually neither adornment nor inscription. There is Elfin whimsy here, as well as raw, primitive and mighty expression. Most of these walls are found around Cusco and the Urubamba River Valley in the Peruvian Andes. There a few scattered examples elsewhere in the Andes, but almost nowhere else on Earth.

Mostly, the structures are beyond our ken. The how, why and what simply baffle. Modern man can neither explain nor duplicate. Mysteries like this bring out explanations scholarly, whimsical, inventive and ridiculous. The main walls were made with andesites that are blackish igneous stones which quarries are in Waqoto on the mountains north of San Jeronimo, or in Rumiqolqa about 35 Kms. (22 miles) from the city. Limestones are found in the surroundings of Sacsayhuaman but they are softer and can not be finely carved as the andesites of the main walls that were of the "Sedimentary or Imperial Incan" type. Destruction of Sacsayhuaman lasted about 400 years; since 1536 when Manko Inka began the war against Spaniards and sheltered himself in this complex. Later the first conquerors started using its stones to built their houses in the city; subsequently the city's Church Council ordered in 1559 to take the andesites for the construction of the Cathedral. Even until 1930, Qosqo's neighbours just paying a small fee could take the amount of stones they wanted in order to build their houses in the city: four centuries of destruction using this complex as a quarry by the colonial city's stone masons.

Sacsayhuaman was supposedly completed around 1508. Depending on who you listen to, it took a crew of 20,000 to 30,000 men working for 60 years. Here is a mystery: the chronicler Garcilaso de la Vega was born around 1530, and raised in the shadow of these walls. And yet he seems not to have had a clue as to how Sacsayhuaman was built.

He wrote: "....this fortress surpasses the constructions known as the seven wonders of the world. For in the case of a long broad wall like that of Babylon, or the colossus of Rhodes, or the pyramids of Egypt, or the other monuments, one can see clearly how they were executed...how, by summoning an immense body of workers and accumulating more and more material day by day and year by year, they overcame all difficulties by employing human effort over a long period. But it is indeed beyond the power of imagination to understand how these Indians, unacquainted with devices, engines, and implements, could have cut, dressed, raised, and lowered great rocks, more like lumps of hills than building stones, and set them so exactly in their places. For this reason, and because the Indians were so familiar with demons, the work is attributed to enchantment."

Surely a few of those 20,000 labourers were still around when Garcilaso was young. Was everyone struck with amnesia? Or is Sacsayhuaman much older than we've been led to believe?. Archaeologists tell us that the walls of Sacsayhuaman rose ten feet higher than their remnants. That additional ten feet of stones supplied the building materials for the cathedrals and "casas" of the conquistadors. It is generally conceded that these stones were much smaller than those megalithic monsters that remain. Perhaps the upper part of the walls, constructed of small, regularly-shaped stones was the only part of Sacsayhuaman that was built by the Incas and "finished in 1508". This could explain why no one at the time of the conquest seemed to know how those mighty walls were built.