U.S. President Theodore Roosevelt proclaims Devils Tower in Wyoming as the nation's first National Monument.

Devils Tower is a butte, laccolithic, composed of igneous rock in the Bear Lodge Ranger District of the Black Hills, near Hulett and Sundance in Crook County, northeastern Wyoming, above the Belle Fourche River. It rises 1,267 feet (386 m) above the Belle Fourche River, standing 867 feet (264 m) from summit to base. The summit is 5,112 feet (1,558 m) above sea level.