The Pont du Gard is an ancient Roman aqueduct bridge built in the first century AD to carry water over 50 km (31 mi) to the Roman colony of Nemausus. It crosses the river Gardon near the town of Vers-Pont-du-Gard in southern France. The Pont du Gard is the highest of all Roman aqueduct bridges, as well as one of the best preserved. It was added to UNESCO's list of World Heritage sites in 1985 because of its historical importance.

The bridge has three tiers of arches made from Shelly limestone and stands 48.8 m (160 ft) high. The aqueduct formerly carried an estimated 40,000 m3 (8,800,000 imp gal) of water a day over 50 km (31 mi) to the fountains, baths and homes of the citizens of Nîmes. The Pont du Gard has been a tourist attraction for centuries. The outstanding quality of the bridge's masonry led to it becoming an obligatory stop for French journeymen masons on their traditional tour around the country, many of whom have left their names on the stonework. 

From the 18th century onwards, particularly after the construction of the new road bridge, it became a famous staging-post for travellers on the Grand Tour and became increasingly renowned as an object of historical importance and French national pride.

- Wikipedia