This universally loved voyage is offered eight times during the spring, summer and fall, and its ports are all classics of the first degree. An evening in Athens encourages unhurried exploration of landmarks such as the Acropolis and allows for excursions into the countryside to spiritual Delphi and beyond. Indeed, Greece is usually the focal point as this cruise plies the Adriatic, Ionian and Aegean Seas, calling on verdant Corfu, gorgeous Santorini, and Delos, an uninhabited island so sacred that it can only be visited during daylight. In time, the attention turns to Turkey, beginning with Kusadasi, from which you may tour the magnificent remains at Ephesus. During an evening in Istanbul, the world’s only city that spans two continents, don’t miss the wonderfully chaotic Grand Bazaar, with its more than 4,000 shops.