hill facing the town is occupied by the terraces of Pumatallis, framed on both flanks by rock outcrops. Due to impressive character of these terraces, the Temple Hill is commonly known as the Fortress, but this is a misnomer, as the main functions of this site were religious. The main access to the ceremonial center is a series of stairways that climb to the top of the terrace complex. At this point, the site is divided into three main areas: the Middle sector, directly in front of the terraces; the Temple sector, to the south; and the Funerary sector, to the north. The Temple sector is built out of cut and fitted stones in contrast to the other two sectors of the Temple Hill, which are made out of fieldstones. It is accessed by a stairway that ends on a terrace with a half-finished gate and the Enclosure of the Ten Niches, a one-room building. Behind them is an open space which hosts the Platform of the Carved Seat and two unfinished monumental walls. The main structure of the whole sector is the Sun Temple, an uncompleted building which features the Wall of the Six Monoliths. The Middle and Funerary sectors have several rectangular buildings, some of them with two floors; also, several fountains are in the Middle sector. The unfinished structures at the Temple Hill and the numerous stone blocks that litter the site indicate that it was still undergoing construction at the time of its abandonment. Some of the blocks show evidence of having been removed from finished walls, which provides evidence that a major remodeling effort was also underway. Which event halted construction at the Temple Hill is unknown; likely candidates include the war of succession between Huáscar and Atahualpa, the Spanish Conquest of Peru, and the retreat of Manco Inca from Ollantaytambo to Vilcabamba,. However it is also theorised that they are the work of the earlier Tiwanaku culture. Terraces The valleys of the Urubamba and Patakancha Rivers along Ollantaytambo are covered by an extensive set of agricultural terraces or andenes which start at the bottom of the valleys and climb up the surrounding hills. The andenes permitted farming on otherwise unusable terrain; they also allowed the Incas to take advantage of the different ecological zones created by variations in altitude. Terraces at Ollantaytambo were built to a higher standard than common Inca agricultural terraces; for