Near the settlement of Mount Pallano develops, for the length of about 160 metres, a defensive wall probably built between the 6th and the 3rd century BC. They are megalithic walls built with large blocks of stacked limestone and reinforced with smaller pebbles: all materials are of this area, extracted from the same mountain on which the walls are. According to a local legend, the great wall was built by Emperor Charlemagne's Paladins, and hence the current definition of " Paladins walls ", but it is, in fact, a legend without historical foundation. City walls have an average height of four metres, reaching somewhere five metres and a half; they follow the course of land, now higher and now lower, so the maximum height difference is about twelve metres. In the original wall there were four doors, but currently there are only two: in the upper part there is the “Porta del Piano”, just eighty centimeters wide and covered by a four stone blocks lintel, while further downstream, towards North, there is the "Porta del Monte", built with smaller stone blocks, but more adherents among them. A difference can be seen between the outside of the walls, distinct in its profile and in the variety of the stones used, and the inside, more similar to an incoherent material filling.