Δήμος Ηρακλείου, GR
The Koules (Greek: Κούλες) 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.
Listen to the audio guide for Rocca a Mare Free on WIP — starts by itself when you arrive, even with the screen off