The Castle of Methoni in Messenia, Peloponnese, Greece: The port was on the route between Venice and Eastern markets, and the Holy Land. Beginning in the Venetians took the area from pirates and fortified it. 300 years later, it fell to the Ottomans.
This island is a must see. Delos island Greece: In the ancient times, the myth of god Apollo, god of light, and goddess Artemis having been born there rendered the island sacred: no mortal would ever be allowed to be born on its land.