Devils Tower, Wyoming

Devils Tower is a dramatic igneous intrusion, or volcanic plug, located at the northeast corner of Wyoming. It was the first official National Monument in the USA, declared to be such by President Theodore Roosevelt in 1906. Devils Tower is a cultural monument with tremendous significance to local natives, and has tremendous cultural significance for others too, as this was the location for the space alien landing site in the 1977 Steven Spielberg film Close Encounters of the Third Kind.