At the edge of the Huisne, a few steps from the city, the former drinking water production plant reveals a unique industrial heritage: steam and hydraulic machines, paddle wheels, Bollée wind turbine. Today an educational centre on water and energy, the Maison de l'Eau offers interactive modules on the water cycle, life in the river, including large aquariums on freshwater fish, as well as an exhibition on energy. Access to the Maison de l'Eau, 51 rue de l'Estérel - 72100 Le Mans. Bus (line 6), Tram: stop Espal.