The city, like Volterra, was run by a warrior bishop, but was annexed by Florence in the 14th century. The Medici then plopped a big fortress across from the cathedral to keep things under control. Strangely, this nexus of political and religious power is at the edge of the city, on the crest of the cliff. The area has now been turned into a very English looking park, and the cathedral has even been given an English belltower, although I don't think there's any connection to England. The park provides expansive views, and apparently only one bench for four strangers to share uncomfortably.