Entering the nave, three distinct architectural styles can be seen at the same time: The narthex ends in two huge pillars, each with a circumference of no less than 11.45m.
Over the northern and southern walls one can see the Romanesque arches, the floor is made of marble and includes some tombs and sepulchres.
Most of the work was done in oak and walnut tree, and the choir seems to be separate from the rest of the church in that it contrasts so much with the Gothic and Romanesque parts.
Inside the sanctuary it is possible to see some representations of the chanson de geste the Song of Roland, with Oliver clearly represented.
This fact, as well as a general description of the cathedral itself and details of its history, features prominently in Canon Alberic's Scrap-Book, a ghost story by M. R. James.