The Tannehill Ironworks is the central feature of Tannehill Ironworks Historical State Park near the unincorporated town of McCalla in Tuscaloosa County, Alabama. Listed on the National Register of Historic Places as Tannehill Furnace, it was a major supplier of iron for Confederate ordnance. Remains of the old furnaces are located 12 miles (19 km) south of Bessemer off Interstate 59/Interstate 20 near the southern end of the Appalachian Mountains. The 1,500-acre (610 ha) park includes: the John Wesley Hall Grist Mill; the May Plantation Cotton Gin House; and the Iron & Steel Museum of Alabama.