The National Road in Pennsylvania traces its roots to Native American trails and was converted by historical figures such as George Washington into a roadway for westward expansion. As the first federally built road in America, it played a crucial role in American history. Today, it is designated as a National Scenic Byway and an All-American Road. Along its ninety-mile stretch, there are significant historic sites, including the French and Indian War, the Whiskey Rebellion, the first cast-iron bridge in America, toll houses, coal mines, historic taverns, and automobile camps. Visitors can find mile markers, memorials, and the distinctive S-bridge.