History was reflected in the urban landscape in the form of an abundance of powerful defensive fortifications. The castle of Castelgrande rises above the old town, Montebello is located to the east of it, and the third castle, Sasso Corbaro, is lost high in the mountains. All castles are included in the UNESCO World Heritage List. Castelgrande, the most imposing of the city's three medieval castles, sits right in the center of the city, on a huge rocky ledge. The beginning of the construction of the castle dates back to the first century BC, this defensive structure was used to house the troops of the Roman Empire.→