Many of the National Road's original stone arch bridges also remain on former alignments, including:
Casselman River Bridge near Grantsville, Maryland – 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 razed) are under the waters of Youghiogheny River Lake (though still visible at times of extremely low water levels).

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 largest suspension bridge in the world until 1851, and is today the oldest vehicular suspension bridge in the United States still in use.
A newer bridge now carries the realigned U.S. 40 and I-70 across the river nearby.

Three of the road's original toll houses are preserved:
La Vale Tollgate House, La Vale, Maryland
Petersburg Tollhouse, Addison, Pennsylvania
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.
Many of the National Road's original stone arch bridges also remain on former alignments, including:
Casselman River Bridge near Grantsville, Maryland – 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 razed) are under the waters of Youghiogheny River Lake (though still visible at times of extremely low water levels).
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 largest suspension bridge in the world until 1851, and is today the oldest vehicular suspension bridge in the United States still in use. A newer bridge now carries the realigned U.S. 40 and I-70 across the river nearby. 
Three of the road's original toll houses are preserved:
La Vale Tollgate House, La Vale, Maryland
Petersburg Tollhouse, Addison, Pennsylvania
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.
National Road