Thorn Abbey Church is a Gothic church built mainly in the 14th century. The Benedictian abbey was originally founded in 975 by bishop Ansfried. The oldest parts in the western part date from c. 1150. The abbey was closed in 1797 and after that its church has server as a parish church. It was restored in 1860-1881 by Pierre Cuypers.
There is a famous mummy located in the glass sarcophagus in the church crypt. The rich interior contains Renaissance and Baroque style altars from 1624 and 1769, a font from the 15th century and organs from the 18th century.
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.