Peyrepertuse is the largest and the best example of the military architecture of medieval southern France. The surface area of this immense fortress is the same as at the Cité of Carcassonne.
               Entrance to the citadel is from the southern side from the village of Duilhac. After the ticket office at the foot of the cliff, the walking path edged with boxwood leads to the northern entrance of the monument.
              The structure is in four parts : the lower courtyard, the old keep, the median courtyard and Saint-Jordi's keep.
              The lower triangular courtyard is defended  at the north by a thick curtain wall set with two semi-circular open-throat towers. This wall is completed at the east by a spectacular spur. The battlements, built with large stone slabs resting on corbels, are still visible at the top of the walls. The medieval latrines are situated in the south in the courtyard wall.
            The old keep, of complex design, consists of the Romanesque church of Saint-Marie and a residence built around a closed courtyard. In the south-west corner there is a tower, equipped with a cistern, which seems to be the oldest building at Peyrepertuse.
              The median curtain-wall, of vast dimensions, is equipped with loopholes for firearms. The remains of a guard post, a vaulted casemate and a big polygonal building stand in this courtyard.
               Lastly, Saint-Jordi's keep is served by a long steep staircase cut into the rock and known as Saint-Louis' staircase. The remains of Saint-Jordi's chapel are among the rooms of the keep.
                 In the village, admire the medieval enclosure called "le Fort” with its fountain decorated with a verse by Ronsard : "quiconque en boira qu'amoureux il devienne” ("whoever drinks of this water shall fall in love”). In the centre, the church of Saint-Michel has been entirely restored. Finally, the gorges of the Verdouble, one kilometre to the east of the village, offer a very nice walk.