Aqueducte de les Ferreres or Tarragona aqueduct, built 1st century AD under Emperor Augustus, to supply drinking water to Tarraco from the Francoli river 15km away, near Tarragona, Catalonia, Spain. The aqueduct is built in opus quadratum style with a double row of arches. Tarragona was an important fortified Roman colony named Tarraco and its remains are listed as a UNESCO World Heritage Site. Picture by Manuel Cohen
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