Under the porchway of the cathedral, crowned by a small open-work gallery, the framework of the old Romanesque doorway has been preserved in the Gothic façade. The Romanesque crypt reveals part of the transept with four apsidioles. In a recess are the remains of the sarcophagus of St Bénigne, Burgundy's first martyr. This burial place opposite a large opening gives onto the lower floor of the rotonda whose architecture reprises Christ's tomb in Jerusalem.