The village church dedicated to Saint Mary Magdalene in Rennes-le-Château has been rebuilt several times. The earliest church of which there is any evidence on the site may date to the 8th century. However, this original church was almost certainly in ruins by the 10th or 11th century, when another church was built upon the site - remnants of which can be seen in Romanesque pillared arcades on the north side of the apse. This survived in poor repair until the 19th century, when it was renovated by the local priest, Bérenger Saunière.
The village received up to around 100,000 tourists each year at the height of popularity of Dan Brown's bestselling novel The Da Vinci Code. The modern reputation of Rennes-le-Château rises mainly from claims and stories dating from the mid-1950s concerning the local 19th-century priest Father Bérenger Saunière. These stories influenced the authors of the worldwide bestseller The Holy Blood and the Holy Grail in 1982, and that work in turn influenced Dan Brown when he wrote The Da Vinci Code, published in 2003.
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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.