🇩🇪 Germany · Hydraulic works
Eifel Aqueduct (Eifelwasserleitung) — Roman Aqueduct to Cologne
Roman Imperial (Flavian to Late Roman, 1st–3rd c CE) · Roman Gallo–German (Colonia Agrippina)
95-km Flavian Roman concrete aqueduct (c.80 CE) delivering 20,000 m³/day from Eifel springs to Cologne.