Devils Tower (also Bear Lodge Butte) is a laccolithic butte composed of igneous rock in the Bear Lodge Mountains (part of the Black Hills) near Hulett and Sundance in Crook County, northeastern Wyoming. It rises dramatically 1,267 feet (386 m) above the Belle Fourche River, standing 867 feet (265 m) from summit to base. The summit is 5,112 feet (1,559 m) above sea level.

The 1977 movie "Close Encounters of the Third Kind" used the formation as a plot element and as the location of its climactic scenes. Witnesses in Dharamshala, India report that the UFOs make distinctive sounds: a five-tone musical phrase in a major scale. Scientists broadcast the phrase to outer space, but are mystified by the response: a seemingly meaningless series of numbers (104 44 30 40 36 10) repeated over and over. Laughlin, (an American interpreter for Lacome) with his background in cartography, recognizes it as a set of geographical coordinates, which point to Devils Tower near Moorcroft, Wyoming. Lacombe (a French scientist) and the U.S. military converge on Wyoming. The United States Army evacuates the area, planting false reports in the media that a train wreck has spilled a toxic nerve gas, all the while preparing a secret landing zone for the UFOs and their occupants.

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