Within the church are three naves, dark and mysterious. The fury of the winds evidently forbade the architect to build out lateral buttresses, such as adorn all other cathedrals, and between which little chapels are usually constructed. Thus the strong walls which flank the lesser naves shed no light into the building. Outside, their gray masses are shored up from point to point by enormous beams. The great nave and its two small lateral galleries are lighted solely by the rose-window of stained glass, which pierces with miraculous art the wall above the great portal, whose fortunate exposure permits a wealth of tracery and dentellated stone-work belonging to that order of architecture miscalled Gothic.
The greater part of the three naves is given up to the inhabitants of the town who come to hear Mass and the Offices of the Church. In front of the choir is a latticed screen, within which brown curtains hang in ample folds, slightly parted in the middle to give a limited view of the altar and the officiating priest. The screen is divided at intervals by pillars that hold up a gallery within the choir which contains the organ. This construction, in harmony with the rest of the building, continues, in sculptured wood, the little columns of the lateral galleries which are supported by the pillars of the great nave. Thus it is impossible for the boldest curiosity, if any such should dare to mount the narrow balustrade of these galleries, to see farther into the choir than the octagonal stained windows which pierce the apse behind the high altar.