The Cathedral Spires are a prominent geological formation located in the Black Hills of South Dakota. These towering granite formations rise sharply from the surrounding landscape, creating a striking visual contrast. The spires are part of the Custer State Park and are popular among hikers and rock climbers due to their unique shapes and challenging routes. The formation is composed primarily of granite, which has been shaped by erosion over millions of years. The Cathedral Spires are not only a natural wonder but also hold cultural significance for the Lakota Sioux people, who consider the Black Hills sacred.