Cliff palace ruin at Mesa Verde National Park in Colorado
The Anasazi cliff dwellers of the 11th to 14th century were the ancestors of the Pueblo peoples of the American Southwest (Utah, New Mexico, Arizona and Colorado). A communal society, the Anasazi were known for basket-making and agricultural endeavors. Their architecture forms a lasting memory of prehistoric southwestern culture. Stonemasonry, sometimes referred to as adobe, was used for communal structures of cellular, contiguous, and flat-roofed rooms. The buildings were erected on mesas or built into canyon walls, and ranged in size from several small units to shelter a few families, to large, multi-storied apartment complexes, whose storage and living spaces accommodated thousands of people. Subterranean ceremonial chambers, called kivas, were the center of Anasazi religious and social life.