Ducal Palace – The impregnable fortress
Palazzo Ducale stands on part of the area once occupied by Augusta, the great fortress, considered impregnable, designed on the basis of some drawings by Giotto and commissioned by Castruccio Castracani. The huge complex, which covered about a fifth of the city, was destroyed by popular uproar in 1370, after Emperor Charles IV of Bohemia had restored the Republic's freedom.