Corso Mazzini Corso Mazzini (and beyond). This is the last tract of the National Cross-Road mentioned above. It is the main artery of the historical centre and the Corso par excellence. It is also the most modern and is flanked by beautiful buildings. In contrast, it leads off to decidedly mediaeval streets and lanes. After the Seat of the Tribunal Courts (formerly the convent of the Filippini) there lies via Plinio il Giovane on the left. This is the continuation of Piazza del Mercato and is also of Roman origin. By going down this street, one comes across piazza Sordini with Sala Pegasus (formerly the twelfth-century church of St. Laurence). On the uppper side there is Palazzo Rosari-Spada (17th-18th century, but with the façade left unfinished). The other palazzo houses the Ente Teatro Lirico Sperimentale "A. Belli". At the bottom of the steps Piazza Collicola opens out. The name derives from the eighteenth-century building situated here which is now the Municipal Gallery ...