Oberkapfenberg is mentioned in a document for the first time in 1173. The current castle was erected around 1264. It was the residence and administrative seat of the Counts of Stubenberg and the seat of the regional High Court for most of the Mürz Valley. Around 1550 it was converted into a Renaissance fortress that was abandoned in 1739 and fell into disrepair. After 1955 the Stubenberg Family rebuilt their ancestral fortress within the old walls and adapted it into a castle hotel. Today Burg Oberkapfenberg is a cultural and culinary attraction of more than regional importance.
References: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.