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Of the medieval town walls only the imposing arch, colloquially nicknamed after Castruccio, is preserved: lying at the foot of the stronghold, its lower parts are made of ashlar blocks, which give way to bricks higher up. All of the doors of the fortress were equipped with ante-gates and guarded by watch towers.
Little today can be recognised of the structures of the medieval house-towers, which were considerably transformed in the following period; the exception to this is the tower that bears Castruccio's name, which retains its thirteenth-century form. The structure of the church, built within the castle walls, stands out.