Barrage de la Rance

Built in 1966, this 750m bridge over the Rance estuary carries the D168 between St-Malo and Dinard, lopping a good 30km off the journey. A feat of hydroelectrics, the Usine Marémotrice de la Rance (Rance Tidal Power Plant) below the bridge generates electricity by harnessing the lower estuary's extraordinarily high tidal range – a difference of 13.5m between high and low tide. The fascinating visitor center is on the western side of the bridge.