Charles V, Holy Roman Emperor, considered them among the best military works ever created in Europe. Born to defend the fortified Pisan citadel from the Aragonese ambitions, you will see them soar majestically, symbolising the Castello district and the capital of Sardinia. The two towers of San Pancrazio and the Elephant were built respectively in 1305 and 1307, in the name of Pisa, by Cagliari-born architect Giovanni Capula. In fact, ‘Castello’ was the centre of political, military and religious power of Cagliari at the time of the Pisan domination, and needed an adequate defensive system. The towers, built using large limestone blocks obtained from the Bonaria hill, both have four levels, with one open side where you will notice the various wooden mezzanines.