Inca architecture is the most significant pre-Columbian architecture in South America. The Incas inherited an architectural legacy from Tiwanaku, founded in the 2nd century B.C.E. in present-day Bolivia. A core characteristic of the architectural style was to use the topography and existing materials of the land as part of the design. The capital of the Inca empire, Cuzco, still contains many fine examples of Inca architecture, although many walls of Inca masonry have been incorporated into Spanish Colonial structures. The famous royal estate of Machu Picchu (Machu Pikchu) is a surviving example of Inca architecture. Other significant sites include Sacsayhuamán and Ollantaytambo. The Incas also developed an extensive road system spanning most of the western length of the continent and placed their distinctive architecture along the way, thereby visually asserting their imperial rule along the frontier.
Inca buildings were made out of fieldstones or semi-worked stone blocks and dirt set in mortar; adobe walls were also quite common, usually laid over stone foundations. The material used in the Inca buildings depended on the region, for instance, in the coast they used large rectangular adobe blocks while in the Andes they used local stones.
The most common shape in Inca architecture was the rectangular building without any internal walls and roofed with wooden beams and thatch. There were several variations of this basic design, including gabled roofs, rooms with one or two of the long sides opened and rooms that shared a long wall. Rectangular buildings were used for quite different functions in almost all Inca buildings, from humble houses to palaces and temples. Even so, there are some examples of curved walls on Inca buildings, mostly in regions outside the central area of Peru. Two-story buildings were infrequent; when they were built the second floor was accessed from the outside via a stairway or high terrain rather than from the first floor.
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Ashlar (ˈæʃlər) is finely dressed (cut, worked) stone, either an individual stone that has been worked until squared, or a structure built from such stones. Ashlar is the finest stone masonry unit, generally rectangular cuboid, mentioned by Vitruvius as opus isodomum, or less frequently trapezoidal. Precisely cut "on all faces adjacent to those of other stones", ashlar is capable of very thin joints between blocks, and the visible face of the stone may be quarry-faced or feature a variety of treatments: tooled, smoothly polished or rendered with another material for decorative effect.
Machu Picchu is a 15th-century Inca citadel located in the Eastern Cordillera of southern Peru on a mountain ridge. Often referred to as the "Lost City of the Incas", it is the most familiar icon of the Inca Empire. It is located in the Machupicchu District within Urubamba Province above the Sacred Valley, which is northwest of Cusco. The Urubamba River flows past it, cutting through the Cordillera and creating a canyon with a tropical mountain climate. In reference to the site’s name, for most speakers of English or Spanish, the first 'c' in Picchu is silent.