On September 24, 1906, President Theodore Roosevelt proclaimed Devils Tower in northeastern Wyoming the first national monument in the United States, using the brand-new Antiquities Act he had signed that June. Today marks 120 years since that proclamation. The igneous butte, rising about 867 feet above the surrounding pine forest, is sacred to many Plains tribes, including the Lakota, who know it as Mato Tipila, or Bear Lodge. This view from the east side was made 18 years before the designation by John C. H. Grabill, a Deadwood, Dakota Territory, photographer who documented the Black Hills region in the 1880s and 1890s. From the Library of Congress John C. H. Grabill Collection, no known restrictions on reproduction.