Coming to you from Chaco Canyon in New Mexico, it’s Fajada Butte:
Fajada Butte is the site of an ancient “Sun Dagger” solar clock that marks the occurrence of the solstices and equinoxes. It’s too delicate for visitors to see in person any more (it was damaged by tourism-induced erosion, and closed to the public in 1989), but still inspiring to look at from a distance.