The musée du Masque de fer et du Fort Royal occupies the most ancient part of the Fort Royal de Sainte-Marguerite. On the ground floor visitors will discover the Federal prisons and the very cell in which the mysterious prisoner known as the Man in the Iron Mask was incarcerated for 11 years . There are also mural paintings realized by the French artist Jean Le Gac. In the Roman cisterns and on the first level can be found underwater archeological remnants from Roman and Saracen shipwrecks (ceramics, cargos of amphoras, drinking glasses...). Fragments of Roman mural paintings coming from the excavation site on the l'île Sainte-Marguerite and a reconstruction of the "laconicum" are also presented. A space dedicated to temporary exhibits gives onto a vast terrace overlooking the sea, facing the Cannes coastline, from the Southern Alps to the Cape of Antibes and the Estérel.