Strong Midsummer's Day that one sees on the right supervises the port in north. The origin of the fort goes up in XIIe century with the commandery of Hospital of Midsummer's Day of Jerusalem. The Square Tower controlled by king Rene dates from XVe century.

Louis XIV begins again with Hospital the Midsummer's Day tower to thus include it in the ramparts raised into 1666, after the fortifications of the commandery Midsummer's Day had been altered by engineer Clerville under the commands of Vauban, it is Louis XIV which will make build by the Knight of Clerville the tower of the Lamp, turn of guet, towards 1670.

Strong the Saint Nicolas's Day in the south, therefore called the Citadel, is built from 1660 to 1664 on command of Louis XIV: one notices the defensive plan out of star, expensive in Vauban.Il existed already at this place, XIIIe century, a tower of defense which will be increased at the following century.