Milestone A Roman milestone engraved in the name of the Emperor Constantine. This milestone stands against the chancel of the parish church and indicates the distance to the centre of Rome. Opening hours Freely available Suggestions Saint-Maurice Abbey Discover 1500 years of history via an outstanding visit to the Royal Abbey of St Maurice. Semblanet's Mill This historic mill is still working. A single waterwheel activates about one hundred different mechanisms. Bâtiaz Castle From the top of its tower, this Middle Ages fortification provides the most beautiful views of the town of Martigny.