Off I-40 exit 204, 7.5 miles east of Flagstaff, Walnut Canyon National Monument preserves the remains of more than 300 pre-Columbian dwellings built on a series of ledges in the 400-foot-deep gorge. Inhabited by the Walnut Canyon community (archeologists are uncertain of what these inhabitants called themselves) about 1000-1200, the single-family dwellings are visible from the visitor center on the canyon rim. Learn More...