Known as voussoir arch bridges (so named for the wedge-shaped or tapered stones used to construct arches) or barrel arch bridges (due to the resemblance to the inside of a wooden barrel), this complex building style is among the strongest and most durable forms. (One of the oldest examples is the Caravan Bridge, which spans the Meles River in Turkey, and dates back to 850 B.C. It is one of the oldest human-made structures in continuous use.)
The Barrel Arch Bridge in Lorton is 23 feet wide and produces an interesting echo effect for those traveling underneath it. The bridge originally crossed a spur of the Lorton & Occoquan Railroad, but the passage is now a recreational trail, and atop the bridge is another trail that runs between historic Barrett House and Central Green at Laurel Hill Park.
Know Before You Go
The "shortcut" from the top of the bridge to the bottom is a rather steep grade. A nearby trail makes for a slightly longer but decidedly safer descent to the walking trail below.