To reach the nave of the church a visitor must walk up sixty steps on a monumental stairway from the street to the west porch, and then another sixty steps to the nave. The porch or terrace of the Cathedral was constructed in the 11th century on the site of the pre-Romanesque church. It was expanded in the mid-12th century when the church above was enlarged, and given massive pillars, columns and pilasters to form three traverses and three grand arcades. To reach the