The Don Carlos wine cellar deserves a brief mention for the importance of the ruins of an ancient Roman wall. These ruins date back to 250 A.D. — i.e. to the period of Emperor Maximian, who built it as a protection around the city – follow the route of Via Monte di Pietà (a street that runs parallel to Via Manzoni). The core of the structure is made of conglomerates of shingles/pebbles and brick fragments bound together by a very tenacious grout/mortar. What remains of this antique can be seen today going down the stairs leading to the cellar of the Don Carlos restaurant, in the middle of the room, surrounded by esteemed national and international wines.