Three churches, the Church of Agii Theodori of Servia, the Church of Agii Anargyri of Servia, and the Basilica of Katichoumena of Servia shine brightly with their exceptional post- Byzantine frescoes, in a uniquely important castle-city of the Byzantine Empire. Located in the Lower City, they lead visitors through otherworldly streets, where the ruins of homes, aqueducts, and churches stand.