(WHTM) — A slow-moving train heading west crosses the Susquehanna River on the Rockville Bridge, north of Harrisburg. Did you know Pennsylvania is home to the longest stone arch bridge in the world?

U.S. News Insider Tip: Grab your camera and go for a stroll on this historic pedestrian-only bridge which spans over the Mississippi ... Rachael Hood, Senior Editor The Stone Arch Bridge is ...