Pont du Gard
The Pont du Gard is an aqueduct and bridge that was built over the Gard River by the Roman Empire. It is located in Southern France, in the Vers-Pont-du-Gard and Remoulins area. The bridge is built on three levels. The lower level has 6 arches and carries a road, the middle level has 11 arches, and the upper level has 35 arches and was used as a water conduit.
Lefèvre, André Wonders of Architecture (New York, NY: Charles Scribner & Co., 1871) 96