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 Roman Amphitheatre It is the only one of the ancient monuments whose remains are still visible in Martigny. The Supersaxo House This residence was partly built at around 1440, and is the oldest in the town. The La Bâtiaz district The La Bâtiaz district is one of Martigny's historic areas, found at the foot of the famous castle with the same name.