Pont du Gard, Nimes

Pont du Gard (15BC to 14AD)

“This bridge, over the river Gard, is 275 metres (900 feet) long and 49 metres (160 feet) high. It was part of an aqueduct nearly 50 kilometres (30 miles) long which supplied Nimes with water. On its first level it carries a road and at the top of the third level, a water conduit, which is 1.8 metres (6 feet) high and 1.2 metres (4 feet) wide and has a gradient of 0.4 per cent. The three levels were built in dressed stone without mortar. The projecting blocks supported the scaffolding during construction.”

' John Julius Norwich. The World Atlas of Architecture. p 154.