Photos: Road Trip 2008 spans the South

The Natchez Trace Parkway Bridge is located in Williamson County, Tenn. It is a concrete double arch bridge that is 1,648 feet long and 155 feet above the valley below. According to the U.S. Department of Transportation, the bridge's arches are "designed to support the deck without evenly spaced spandrel columns, resulting in a picturesque, unencumbered appearance."

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Photo by Aaron Sakovich

Caption by Daniel Terdiman