Inside the church, you will find the abbey’s crown jewel: 72 square meters of polychrome floor mosaics, created around eleven twenty-four. These are among the most significant medieval mosaics in France, unique for their scale and artistry. If you look closely at the central apse, you will see a vibrant universe of red, white, and black tiles depicting fantastical beasts like griffins, dragons, and centaurs, alongside geometric motifs that suggest a strong Byzantine or Eastern influence. For a long time, these treasures were hidden beneath rubble, only to be rediscovered in 1898. For a practical pointer, please keep in mind that the church is an active place of prayer; visitors are typically allowed to view the mosaics between three p.m. and five p.m., as the church often closes for the monks' midday tasks and re-opens for afternoon chanting.