The Romanesque basilica of Toarcla dates from the 13th century and is dedicated to St. Catherine. At the turn of the 15th to the 16th century, it was fortified. It has two side aisles and a mighty west tower, which is as wide as the central nave. The choir with semicircular apse has a cross vault. The first floor of the tower also boasts a cross vault and carries the western gallery. Below the sound windows of the belfry of the tower, there are twin windows with round arches.