Besançon, France
Listed as a UNESCO World Heritage Site, Vauban's 17th century masterpiece, the Besançon Citadel, is considered to be one of the finest in France. The fortifications cover 11 hectares and lie more than 100 metres above the old town sitting in a loop of the River Doubs. The site is encircled by ramparts topped by walkways and punctuated with watchtowers and bartizans. The walls are up to 20 metres high and 5 to 6 metres thick. The Citadel offers visitors spectacul...