18 : National Road|All-American Roads|Historic trails and roads in the United States|History of the United States (1789–1849)|Roads on the National Register of Historic Places|Historic Civil Engineering Landmarks|History of Cumberland, MD-WV MSA|National Register of Historic Places in Ohio|Roads on the National Register of Historic Places in West Virginia|National Register of Historic Places in Indiana|National Register of Historic Places in Pennsylvania|Roads on the National Register of Historic Places in Maryland|1811 establishments in the United States|Scenic byways in Ohio|History of Washington County, Pennsylvania|U.S. Route 40|1800 establishments in the United States|History of Fayette County, Pennsylvania