The Castle of Lanjarón, locally known as the Moorish Castle, is a small medieval fortress located a quarter mile from the village. It is dominating on a rocky outcrop, the valley of the Lanjarón River, next to the Salado canyon. It is formed by two enclosures with some small sections of the outer wall. Signs of a tower are preserved; a bastion square, masonry at its bottom and above a adobe. At the south of the complex is an underground cistern, covered with a vault of brickwork.
Lanjarón castle was built between the 13th and 16th centuries in the late Moorish age and restored by Christians later.
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.