Alt-Wartburg Castle was built around c. 1200 by the lords of Ifenthal. It was significanly extended in 1325. In the mid-14th century Alt-Wartburg became the property of the Büttikon family and later Hallwyler family. When the Confederates conquered Aargau in 1415, Bernese troops burned down the castle. Alt-Wartburg was left 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.