Rocca a Mare
Heraklion Municipality, Greece · built 1523
The Koules or Castello a Mare ("Fort on the Sea" in Italian) is a fortress located at the entrance of the old port of Heraklion, Crete, Greece. It was built by the Republic of Venice in the early 16th century, and is still in good condition today.
Fort data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).