Greek line Celestyal offers the chance to sail around a selection of islands in a handful of days, staying in port longer at popular destinations such as Mykonos and Santorini.

Celestyal's two ships also call at less-visited places including the island of Milos, the Turkish port of Kusadasi - close to the ancient ruins of Ephesus - and Greece's second-biggest city, Thessaloniki, which has a rich Roman and Jewish heritage.