(Antietam Ironworks, 151’, 1832) across Antietam Creek S. of Sharpsburg, Sharpsburg Township, Washington County, MD. Harpers Ferry Rd. S. 3.0 miles from jct with Main St. in Sharpsburg to the bridge. (N39 25.018 W77 44.526) Photo by Paul Chandler 3-29-22.