Castles, palaces and mansions Castello di Longi o Medievale Longi Castle dates back to the Middle Ages. We know that it was enlarged during the domination of the Lombards, around the twelfth century. This building has been refurbished several times. The last renovation was done in the 19th century. It is thought to be used for civil purposes, rather than military, since there are no towers in the structure. Today there are only ruins left.