Forte Sangallo
Nettuno, Italy · built 1501
Forte Sangallo, also known as the Fortezza di Nettuno, is a Renaissance fortification built on the Tyrrhenian Sea, in the historic village of the City of Nettuno, in the south of Rome. The fortification is a very popular tourist destination today with its well-preserved old quarter (the medieval village) with narrow streets and small squares.
Fort data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).