This 10th-century château is surrounded by ancient circular walls. You can enter through the 17th-century Porte de l'Horloge or the Porte Bourg Neuf. The château is one of the most beautiful in Provence, with its courtyards, towers, and walls. Once this was the residence of the archbishops of Arles, lords of Salon. Both François I, in 1516, and Marie de Médici, in 1600, visited and stayed here. From 1831, it was used as a barracks and was severely damaged in an earthquake in 1909, but over the years it has been gradually and attractively restored.

The château houses the Musée de Art et d'Histoire Militaire, with a collection of more than 20,000 artifacts, including military uniforms, weapons, waxwork figures, and military flags. The museum covers the era from Louis XIV, the Sun King, up to France's entry into World War I.