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From ancient sewers to mines, here are what are believed to be some of the oldest, still-working civil engineering projects ever.

Khorasane janubiKhorasane ra aviTiber riverItaly generalSaudi arabiaPonte rottoWikimedia commonsPonte palatinoKarize kay khosrowMiddle eastNorth africaKay khosrowCloaca maximaMahiyangana raja maha viharastupaOldest civil engineeringOldest bridge