The Old Church of Loppi, also known as Santa Pirjo (St. Birgit), was built in 1660s. The history of simple and bare wooden church is quite unknown because documents of building were destroyed by fire. According some investigations the church could be completed already in the tide of 15th and 16th centuries, but the age of wall logs is dated to the year 1666.
Only couple of tombs remain of the old cemetery near the church. Nowadays Loppi Old Church is popular wedding and concert church.
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.