Devils Tower, which means “Bear Tower”, is a monolithic igneous intrusion or volcanic neck located in the Black Hills in northeastern Wyoming, above the Belle Fourche River. It rises dramatically 1,267 feet (386 m) above the surrounding terrain and the summit is 5,112 feet (1,558 m) above sea level. Devils Tower was the first declared United States National Monument, established on September 24, 1906, by President Theodore Roosevelt.
