Vannes lies on the edges of the Gulf of Morbihan, which means it is a maritime city. The Promenade des Remparts will take you from the Porte Prison to the Porte Saint-Vincent on the traces of the vestiges of the Gallo-Roman walls. You will discover the majestic Constable's Tower. In old Vannes, the narrow streets are lined by timber-framed houses, the oldest from the 16th century. The Chateau de l'Hermine was the favourite residence of the Dukes of Brittany for a long time.