From Piazza San Giovanni, Via Roma leads back down the hill into the medieval heart of the town. As you approach Via Ricciarelli you’ll see several 13th-century “tower homes.” If you walk back up Via Ricciarelli to Via dei Sarti, you’ll soon come to the municipal museum, which houses a wonderful collection of paintings including pieces by Signorelli, Ghirlandaio, il Volterrano and Rosso Fiorentino. More medieval homes are to found as you continue along Via dei Sarti on your way to the Roman Theatre. Built in the 1st century B.C., it was first brought to light in 1950 and the excavations are still under way. You can see the proscenium and a small part of the risers, where a thermal bath building was added in the later years of the Empire.