America's first declared national monument (in 1906): Devils Tower in northeast Wyoming, also known by more benign names, including Bear Lodge, by indigenous American Indians. The National Park Service, which manages the attraction, declares each June as a "climb-free" period (with mixed success), out of respect for nearby tribes, who consider the monument sacred and loathe the “Devils Tower” name. Original image from Carol M. Highsmith’s America, Library of Congress collection.