From the record
“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.”
Wikipedia article Tannehill Ironworks, CC BY-SA 4.0.
One of 47 National Register listings published here for Tuscaloosa County · listed in 1972 · category: Site.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service