Saintes - Roman Thermes De Saint Saloine
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These Roman Baths dating from the 1st century CE were served from three water sources over a distance of ten kilometers by aqueducts, water channels and finally a lead siphon pipe system under the river Charente leading to a water tower.  A truly impressive feat of civil engineering.  One or two towers of the aqueducts still stand today in the countryside but for the most part they were demolished as a source of building materials and fortifications during the dark ages. 
See: <a href="https://mediolanum-santonum.fr/aqueducs.html" rel="noreferrer nofollow">mediolanum-santonum.fr/aqueducs.html</a>
romanthermesdesaintsaloine roman baths aqueducts