Gnandstein castle was built in the Romanesque style in the 13th century, probably only with a rectangular groundplan and a residential tower. Parts of the present building still date from this early period. The external walls were extended several times.
During the Thirty Years' War the castle was attacked by Swedish troops and partly destroyed. Shortly before the end of the war the south wing burned down after being struck by lightning.
The well house is more than 33 meters high, giving the visitor a broader view of the region. It was used as a watch tower. Guided tours are available.
References: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.