Cathedral of the Transfiguration of the Saviour

Lonely Planet review

The attraction here is the Unesco-protected, nonworking Cathedral of the Transfiguration of the Saviour , whose 12th-century frescos are considered to be one of the most complete representations of the biblical narrative to have survived the Mongols. The frescos have been partially restored after centuries of damage from flooding, whitewashing and scrubbing; 80% of what you see today is original. The artists are unknown but were almost certainly from Greece, based on the Byzantine-style of the frescos.