Somló castle was built in the 13th century soon after the Mongol Invasion. It had a great deal of owners. Kinizsi Pal was also among them but the castle’s golden age was when the bishop of Eger, Bakócz Tamás bought it in the late 15th century. He rebuilt it and it served as a castle and as a chapel. The Turkish tried to occupy several times unsuccessful. By the 18th Century it was a bad condition. The ruins are not easy to reach, but when you get there, you will have a spectacular view on the Somló wine region.
The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.