Basílica de Santa Eulalia may have been the first Christian temple erected to Spain after Christianization of Roman empire. It was dedicated to Eulalia of Mérida, a young Roman Christian martyred in Augusta Emerita in 304 AD. The current church was built in the 13th century after it has been conquered by Christians during Reconquista.
Basilica contains collection of tombs of very distinct periods, oldest the considerably big, late-Roman mausoleums.
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.