Fort Sainte-Agathe is the oldest fortification on the island of Porquerolles, of which it dominates the village and the port in the Var department. Today listed in the additional inventory of Historical Monuments and assigned to the Port-Cros National Park, it was built under King François I around 1531. The fort takes the form of a large round tower housing a large vaulted room and surmounted by a terrace converted into a battery. The complex is surrounded by a trapezoidal enclosure against which buildings are leaned.