It has six sturdy towers which formed two distinct inner spaces: the "Cortile delle Armi", for the troops, and the "Cortile d'onore" for the use of the city's governor.
* Veličastna trdnjava Rocca Albornoziana, zgrajena med letoma 1359-1370, ki jo je zasnoval arhitekt Matteo Gattapone Gubbio za kardinala Albornoza.