Nejdek Castle history is unclear. According to hypotheses, the castle was built from the end of the 13th century to the beginning of the 14th century. According to the feudal letter of 1341, the first documented castle owner was the knight Konrad Plick. At the beginning of the Thirty Years War the castle was probably still there and inhabited. In the course of the Counter-Reformation, rule came to Count Hermann Czernin in 1633. His nephew, Count Humprecht Johann Czernin, probably caused the old walls to be demolished due to disrepair and to use the building material to build the new castle in Neudek.
Today the tower and some fragments of original castle remains.
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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.