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Pont du Gard, giant bridge-aqueduct, a notable ancient Roman engineering work constructed about 19 bce to carry water to the city of Nîmes over the Gard River in southern France. Augustus Caesar’s son-in-law and aide, Marcus Vipsanius Agrippa, is credited with its conception. It is listed as a UNESCO World Heritage site. Three tiers of arches rise to a height of 47 metres (155 feet). The first tier is composed of 6 arches, from 15...