One can walk round the whole town hardly ever losing sight of the boundary walls (where only one gate is missing, the “Porta del Marmoreo”, demolished in the 19th c.) The six gates which lead into the town are of remarkable interest: the towering Porta di Sant’Agostino, the double Porta di San Pietro, the Porta degli Ortacci, the Porta del Borgo (also called Porta di Santa Lucia), and those of Santa Croce and “dell’Angelo” (also known as Porta di Sant’Ubaldo). Some of them still show remains of painted decoration and coats of arms of the city, or even preserve the old wooden doors.