The Inka power structure was manifested in architectural patterns that were reiterated throughout the Empire. Buildings were usually made of stone worked in varying degrees, although in some places adobe or thatch were also used. Inka buildings usually had a rectangular floor plan, with trapezoidal doors, windows and vaulted niches. The roofs of these structures were gabled. Other Inka structures included the kancha or open area, used for rituals of institutionalized reciprocity. In each zone the Inka built an administrative center or remodeled an existing one.
The Inka capital of Cuzco was a planned city, with administrative services, buildings, palaces and residences. The Inka ruler lived there with his court and servants, along with an estimated 300,000 other inhabitants. One of the Empire’s unifying elements was the Inka Road (Camino del Inka or Qhapaqc Ñan) a road network with two trunk lines running north-south (one along the coast and the other in the highlands), branch roads running east-west, and side roads to smaller localities. The road ranged from 3 to 15 meters wide, with some segments cobbled and some of packed earth, and included stairways in steep sectors and bridges over ravines and canyons. Inka roadside inns, called tambos, and rest stops, called chasquiwasis, served those who traveled along the Inka Road, especially the official messengers, known as chaskis.