Parco della Cittadella

From http://turismo.parma.it/Inglese/page.asp?IDCategoria=260&ID=34817:

Alessandro Farnese , the third Duke of Parma, towards the end of the 16th century, commissioned this fortress that is in pentagonal form surrounded with moats and bastions.

He projected it to the last detail inspired by the fortress in Anversa by Francesco Paciotto. Cittadella never once defended the city from invaders, who in fact, occupied it at times. Instead, it used its power against subversive individuals becoming a prison and torture chamber.

It was transformed into a police barracks, but over the last years it has become a public park, maintaining parts of the ancient structure, such as the pentagonal base plan and entranceway.