The Anasazi were a fascinating culture of Native Americans that lived in what is now the southwestern U.S. until sometime during the 13th century. They built extensive stone “villages” at several locations including Mesa Verde in Colorado, Chaco Canyon in New Mexico, Canyon de Chelly in Arizona, and Hovenweep in Utah. They also left countless smaller ruins scattered around the southwestern U.S. All of the structures are built of layered sandstones which are ubiquitous in the southwestern U.S.