The Gabriel Tower (Gabriel Tour) was built in 1524 by Gabriel de Puy, a French military engineer. The orginal purpose was to protect the storerooms of the Abbey of Mont-St-Michel. The construction allows to use a wide scale of shooting angles. The military importance of the Mont-St-Michel ceased in the 18th century and a windmill is placed on the top of the tower. In 19th century, a lighthouse was added.