The Ollantaytambo Archaeological Park was a fortified city built by the Inca Pachacutec, at the time of the conquest served as a fort for Manco Inca Yupanqui. This city was constituted as a military, religious, administrative and agricultural complex built on two mountains in a strategic location overlooking the entire sacred valley. Ollantaytambo was also an important tambo or city that housed enormous food deposits and places for astronomical observation. It is fundamental to emphasize that this fortress shows the foresighted spirit of the Incas that supplied it with water by means of internal aqueducts, conformed by diverse platforms and walls finely carved in the hillsides, it is a purely religious construction, it is ascended by a stone stairway, between twenty and thirty< minutes, toward the right the straight and wide platforms are located, oriented toward the side of the square. Almost arriving at the top is located the enclosure of the ten niches, with finely worked stones, where you access the temple of the sun, which is a magnificent structure of six monoliths of red porphyry, in which are carved staggered crosses or Chacanas. These pieces resisted the onslaught of the extirpators of idolatries who destroyed the temple and left their pieces scattered. The urban functionality of this complex clearly shows the high degree of development and urban planning of the pre-Hispanic period, a description that corresponds to the first sector called Qosqo Ayllu. <span class="automatic-translation-warning">This text was automatically translated.</span>