The Church of St. Agatha at College with its poly-chromatic marble was built between 1600 and 1610, in late-Renaissance style, on the site of a previous church, which had also been dedicated to St. Agatha. The façade was created by Natale Masuccio, and is decorated with frameworks on a light coloured background. It has a Greek cross plant, with splendid Baroque decorations including frescoes by Luigi Borremans (18th century). The work on the adjacent Jesuit College began in 1589 and were completed in the second half of the 19th century.
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.