Steelton Steel Works, Pennsylvania

This former Bethlehem Steel plant in Steelton, Pennsylvania, stretching for four miles along the Susquehanna south of Harrisburg, was the first large-scale integrated steel complex in America, and the first plant to use the Bessemer steel-making process. It was established in 1866 by the Pennsylvania Steel Company, and is one of only three plants in North America that still produce railroad rail, the same product that the plant was built for nearly 150 years ago.