The Poenine Way A Roman road At the entrance to the ancient town, the Great Saint Bernard road was covered with impressive paving stones still visible today. Opening hours Freely available Suggestions Milestone A Roman milestone engraved in the name of the Emperor Constantine. Semblanet's Mill This historic mill is still working. A single waterwheel activates about one hundred different mechanisms. Monumental stained-glass window by Edmond Bille Situated at the heart of the Town Hall, this great stained-glass window reminds us of Martigny's past.