Vizmburk Castle was founded by Tas or Peter of Skalice and it was mentioned first time in 1279. This noble house with the stirrup in their coat of arms was known already in the 12th century, when their members held the burgrave office in Kladsko. The Vizmburk estate was a fairly large one with the economic centre in the town of Úpice.
In 1330 the the lords of Dubá owned the estate. Jiří of Dubá supported the Hussites movement which resulted in frequent raids of his estate by Silesian troops. The princes and burghers of Silesia and Lusatia eventually sealed the faith of the Vizmburk castle. Instead of arms they used the power of money. In 1447 the castle was bought up and intentionally demolished.
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.