Citadelle de Calais (Citadel of Calais), Calais

Located in the northwest corner of the city, the Citadel was a former Medieval castle and on its ruins was constructed a vast citadel better oriented to the new techniques of war. Built between 1560 and 1571, the castle forms a square enclosure with six towers. On the occasion of their visit, Louis XIII and cardinal Richelieu considered making Calais an immense walled city that could become a vast military harbour. But this project amounted to nothing and only an arsenal and two new bastions were built.