View into Walnut Canyon National Monument, located about 10 miles from Flagstaff, Arizona.
The canyon’s rim elevation is 6,690 feet Its floor’s is 350 ft lower. A long, looping trail leads to 25 cliff-dwelling rooms constructed by the Sinagua, a pre-Columbian cultural group that lived in the gorge from about 1100 to 1250 CE. (CE is an increasingly accepted designation — as of 2019 — denoting the current “Common Era” as opposed to the older, less-regarded term “AD,” or the period after the death of Christ.) Original image from Carol M. Highsmith’s America, Library of Congress collection. Digitally enhanced by rawpixel.