Museum of Byzantine Culture and Archaeological Museum
With a dozen chapels and monasteries scattered throughout the city (including the spectacular Rotunda, with a faded band of saints and angels decorating the cupola), Thessaloníki’s Byzantine history is ever present. This architectural masterpiece contains a collection of stunning frescoes, mosaics, icons and tombstones that evoke the transition from antiquity to Christianity. The hidden café in the walled garden is lovely. For a couple more euros, a combined ticket gets you into the equally magnificent Archaeological Museum across the street—don’t miss the treasures in the Gold of Macedon exhibit.