Since the Middle Ages, Entraigues and Valbonnais have been the two major towns in the valley. The towns produce an impression of coherence, despite a wide variety of architecture. In Valbonnais, we can see, in particular, the castles and fortified manor houses with their impressive dimensions and well-ordered façades, with sculpted wooden doors made for the local notables. Another witness to the town’s history is the train station: from 1926 to 1950, Valbonnais had a meter-gauge railway with electric engines (La Mure – Corps line), with a line running to the cement works downstream, near Le Pont-du-Prêtre.