Editing National Road (section)

===Historical structures===
[[File:CardCasselman014.jpg|thumb|The [[Casselman Bridge|Casselman River Bridge]] in western Maryland, completed in 1814]]
[[File:National Road marker, Columbus, OH 01.jpg|thumb|Mile marker along the National Road in [[Columbus, Ohio]]]]

Many of the National Road's original stone [[arch bridge]]s also remain on former alignments, including:
* [[Casselman Bridge, National Road|Casselman River Bridge]] near [[Grantsville, Maryland]]{{snd}}Built in 1813–1814 to carry the road across the [[Casselman River]], it was the longest single-span stone arch bridge in America at the time. 
* [[Great Crossings Bridge]] near [[Confluence, Pennsylvania]]—built in 1818 to carry the road over the [[Youghiogheny River]]—the bridge, and the adjacent town of Somerfield, Pennsylvania (which was [[Demolition|razed]]) are under the waters of [[Youghiogheny River Lake]] (though still visible at times of extremely low water levels).<ref>{{cite news |last = Lowry |first = Patricia |title = A bridge to the 19th century: Falling water-level of Youghiogheny unearths ghost town, historical crossing |date = January 7, 1999 |work = The [[Pittsburgh Post-Gazette]] |url = http://old.post-gazette.com/magazine/19990107bridge3.asp |access-date = July 17, 2017 }}</ref>
Another remaining National Road bridge is the [[Wheeling Suspension Bridge]] at [[Wheeling, West Virginia]]. Opened in 1849 to carry the road over the [[Ohio River]], it was the [[List of largest suspension bridges|largest suspension bridge]] in the world until 1851, and until 2019 was the oldest vehicular [[suspension bridge]] in the United States still in use, although it has since been closed to vehicular traffic due to repeated overweight vehicles ignoring the weight limits and damaging the bridge. A newer bridge now carries the realigned US&nbsp;40 and [[Interstate 70 in West Virginia|I-70]] across the river nearby.

Three of the road's original toll houses are preserved:
* [[La Vale Tollgate House]], in [[La Vale, Maryland]]
* [[Petersburg Tollhouse]], in [[Addison, Pennsylvania]]
* [[Searights Tollhouse, National Road|Searights Tollhouse]], near [[Uniontown, Pennsylvania]]
Additionally, several [[Old National Pike Milestones]]—some well-maintained, others deteriorating, and yet others represented by modern replacements—remain intact along the route.