Forte Gonzaga, also known as Castel Gonzaga, is a bastioned fort in Messina, Sicily. It was built in the mid-16th century, and it remained in use by the military until 1973. Today, the fort is in good condition.
Wikipedia https://en.wikipedia.org/wiki/Forte_Gonzaga
Address (Unnamed Road), Messina 98124, Italy
Coordinates 38°11'17.225" N 15°32'26.665" E