The Rockville Bridge, at the time of its completion in 1902, was, and remains, the longest stone masonry arch railroad viaduct in the world. Constructed between April 1900 – April 1902 by the Pennsylvania Railroad. The bridge opened March 30, 1902. It has forty-eight 70 foot spans for a total length of 3,820 feet. The bridge crosses the Susquehanna River north of Harrisburg Pennsylvania. Two rail lines use the bridge, Norfolk Southern Railway and Amtrak Keystone Corridor. The bridge was listed on the National Register of Historic places in 1975.