The Devils Tower National Monument is in Wyoming,U.S. It was the first American national Monument and was established in 1906. Its also known as Bears Lodge. President Theodore Roosevelt proclaimed Devils Tower As the first national monument in 1906. The Devils Tower rises 1267 feet above the Belle Fourscore River.It features a natural rock tower, the remnant of a volcanic interruption now exposed by erosion. This 1347-acre park is covered with pine forests, woodlands, and grasslands. Wild animals like the deer and prairie dog can be found here.