The Citadel of Besançon is a historic fortress located in the city of Besançon, France. Built between 1668 and 1711 by the architect Vauban, it was designed to protect the city and its strategic location. The citadel is perched on a hill, offering stunning views of the surrounding area and the Doubs River. Today, the citadel is a UNESCO World Heritage site and houses several museums, including the Museum of Comtois and the Museum of Natural History. Visitors can explore its impressive architecture, learn about its history, and enjoy the beautiful gardens that surround the fortress.