Saint Nicholas Orphanos is one of Thessaloniki's quieter Byzantine treasures, tucked into Ano Poli rather than sitting on the city's main ceremonial axis. Its scale is modest, but the fourteenth-century frescoes make it a serious stop.
The church belongs to the city's UNESCO-listed paleochristian and Byzantine heritage, and it rewards visitors who seek out the smaller sites between the Rotunda, city walls, and larger churches. Check opening hours, which can be limited.