Stone State Park is an urban wildlife sanctuary on the edge of Sioux City and the heart of the Loess Hills. The Civilian Conservation Corps (CCC) built many of the park’s structures in the 1930s including entrance portals, the Calumet shelter and a rustic stone lodge. Visitors can explore the natural history of the park by walking its many of miles trails, looking for wildlife and birds, or at the nearby Dorothy Pecaut Nature Center.