Sønder Bjert Church was built near the end of the 12th century out of stone cut from boulders and originally did not have a tower. The church's roofing consists of lead, which was last renovated in 2000. The crucifix was built in the mid-13th century and altarpiece was made by Hans Dreyer in 1624. The baptismal font dates from around 1650.
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.