This world-famous monument above the Gardon River was built in 34 CE and is a UNESCO World Heritage Site. The bridge bears witness to the brilliance and ingenuity of the Roman engineers, part of the Nimes aqueduct built to carry water over a distance of 50 kilometers (31 miles) from a source near Uzès, across gorges and hills, to the city of Nîmes. The Pont du Gard carries the aqueduct across the gorge of the Gardon River, spanning the distance between its banks. After the fall of the Roman Empire, the Pont du Gard was maintained by the lords and nobles to be used as a toll bridge, preserving this ancient monument for the admiration of future generations. One of the best preserved elevated Roman aqueducts and the highest of the lot, the Pont du Gard is one of France's most visited historic attractions.