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Montreuil-sur-Mer has seen every invasion and war that has marked northern France.
It is true to say that its location on a spur overlooking three valleys and the former control it exerted on the sea ans the road that stretched from Normandy to Flanders cold not but give the town a military vocation.
More than three kilometres long, its walls are oneof the largest bastioned structures in France.
Almost intact, it is a remarkable witness to the evolution of the fortification over seven centuries; today it constitutes a superb walk, taking in history and nature.
Do not miss the Citadel, built in the 16th century, and the Saint-Saulve abbey-church, housing one of the most curious religious treasures in France.
You can then stroll around the picturesque streets of Montreuil with their 17th and 18th century houses, where Victor Hugo located part of his saga "Les Misérables".