Blasimon Benedictine abbey was founded in the 10th century. The 12th century church is still standing, restored in the 15th and 16th century. In the past, monks dug ditches fill with river Gamage's water, surrounding the abbey. These ditches transformed the abbey to a stronghold. Unfortunately, the French Revolution damaged the abbey and today it is ruined.
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.