the Willkanuta River. The main settlement is located on the left margin of the Patakancha with a smaller compound called 'Araqhama on the right margin. The main Inca ceremonial center is located beyond 'Araqhama on a hill called Cerro Bandolista. Several Inca structures are in the surrounding areas, and what follows is a brief description of the main sites. Town The main settlement at Ollantaytambo has an orthogonal layout with four longitudinal streets crossed by seven parallel streets. At the center of this grid, the Incas built a large plaza that may have been up to four blocks large; it was open to the east and surrounded by halls and other town blocks on its other three sides. All blocks on the southern half of the town were built to the same design; each comprised two kancha, walled compounds with four one-room buildings around a central courtyard. Buildings in the northern half are more varied in design; however, most are in such a bad condition that their original plan is hard to establish. Ollantaytambo dates from the late 15th century and has some of the oldest continuously occupied dwellings in South America. Its layout and buildings have been altered to different degrees by later constructions; for instance, on the southern edge of the town, an Inca esplanade with the original entrance to the town was rebuilt as a Plaza de Armas surrounded by colonial and republican buildings. The plaza at the center of the town also disappeared, as several buildings were built over it in colonial times. 'Araqhama is a western prolongation of the main settlement, across the Patakancha River; it features a large plaza, called Manyaraki, surrounded by constructions made out of adobe and semicut stones. These buildings have a much larger area than their counterparts in the main settlement; they also have very tall walls and oversized doors. To the south are other structures, but smaller and built out of fieldstones. Araqhama has been continuously occupied since Inca times, as evidenced by the Roman Catholic church on the eastern side of the plaza. To the north of Manyaraki are several sanctuaries with carved stones, sculpted rock faces, and elaborate waterworks; they include the Templo de Agua and the Baño de la Ñusta. Temple Hill 'Araqhama is bordered to the west by Cerro Bandolista, a steep hill on which the Incas built a ceremonial center. The part of the