A church by the name of Saint-Pierre existed in Avignon already in the 7th century. The collegiate church was founded in 1358 with the construction of the canons' building and the cloister, the apse and the belltower. Side chapels were added in the 15th century, and the nave enlarged. Outstanding carved wooden doors with decors from the late Renaissance period. Several sculpted works inside, and paintings by Simon de Châlons, Parrocel and Nicolas Mignard. Relics of Blessed Pierre de Luxembourg.
The Château de Foix dominates the town of Foix. An important tourist site, it is known as a centre of the Cathars. Built on an older 7th-century fortification, the castle is known from 987. In 1002, it was mentioned in the will of Roger I, Count of Carcassonne, who bequeathed the fortress to his youngest child, Bernard. In effect, the family ruling over the region were installed here which allowed them to control access to the upper Ariège valley and to keep surveillance from this strategic point over the lower land, protected behind impregnable walls.
In 1034, the castle became capital of the County of Foix and played a decisive role in medieval military history. During the two following centuries, the castle was home to Counts with shining personalities who became the soul of the Occitan resistance during the crusade against the Albigensians.