From the level of the Plenary Hall, two monumental staircases lead up to the Corridoio dei Busti, which branches into three aisles that flank the Courtyard of Honour. The corridor consists of a long vaulted gallery containing busts of important personages from the history of the Italian Republic. Another adjoining corridor is lined with marble busts of the leading lights of the Risorgimento and of post-unification Italy, including Garibaldi, Mazzini, Cavour and Cattaneo.