Its Renaissance storeys separated by a balustrade from a Classical upper section give the lighthouse (67.5m) an impression of durability. A postern leads to a circular bastion protecting the building from the pounding ocean (it was here that the keepers lived). On the ground floor, a monumental doorway leads to a 311-step staircase up to the lantern. The first floor has the king's apartment, and on the second floor is a chapel (above the door is a bust of Louis de Foix) with a fine dome.