Joliet Iron Works Historic Site
This old steel mill was one of the largest in its day but now is a set of mysteriously beautiful ruins. A pretty walking path takes you through the ruins and there are interpretive signs that tell you a little bit about the history. Because this is a self-guided tour you're free to linger and take photos. Take care to stay on the path; some of the structures are not sound. These dangerous areas will be marked with a bright red warning sign.