This church is well worth a visit for the perfection of its detail, such as its finial-crowned pinnacles and the delicate tracery of its rose windows. The left portico is decorated with statues of the twelve apostles. The vaults and walls above the large arcades are covered with 15C frescoes that depict the life of the Virgin Mary. The right transept is dedicated to the representation of hell. Several 15C statues are also displayed, including Notre Dame de Kernascléden, St Sébastien, and a Pietà.