Bosa defended by many towers and by the castle

In Bosa, on the top of the hill of Serravalle dominates the castle of the Malaspina family, marquises of the Lunigiana, of which remain the defence walls and the north keep (similar to the towers of San Pancrazio and the Elefante, constructed in Cagliari by the same architect). In 1300's were strengthened the measures of defence to protect from the assaults of the Aragoneses.

Inside the Malaspina castle, there is the small church of Nostra Signora di Regno Altos.

Along the coast of Bosa we find some towers of sighting and defense of the territory, among which rises the Aragonese tower of the Isola Rossa and the Argentina and Columbargia towers, all dated back to the XV-XVI century.