Masonry remnant in the Colorado portion of Hovenweep National Monument, a widely dispersed example of architectural ruins from the Anasazi — or "ancient people's" — period preceding the arrival of Puebloan Indian tribes in the lands where present-day Colorado, Utah, New Mexico, and Arizona meet.
Once home to more than 2,500 people, Hovenweep includes six prehistoric villages built between A.D. 1200 and 1300. Original image from Carol M. Highsmith’s America, Library of Congress collection. Digitally enhanced by rawpixel.