When friends ask you where you’re going in Greece and you say “Thessaloniki!” you sometimes get a polite, blank smile in return. “Ah.” They say. Sometimes they add: “Where is that, exactly?” Then, you mention Alexander the Great, and the Ancient Kingdom of Macedonia, and maybe Mt. Olympus (it’s right across the bay), and a picture starts to form. The truth is, that popular travel cliché “A well-kept secret” really does apply here.