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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Sigmaringen Castle was first mentioned in the year 1077 in the chronicles of Petershausen monastery. The oldest parts of the castle are concealed beneath the alterations made during the 17th and the 19th centuries. The secret of the earliest settlement built on this defendable rock will never be fully revealed: large-scale excavation work would be necessary, which the extensive land development renders impossible. Judging from the many Roman remains unearthed in the area around Sigmaringen, the 12th century keep known as the 'Roman Tower' could be traced back to a Roman predecessor.
The castle remains that have been preserved (gate, great hall and keep) date back to the Staufer period around 1200. The castle remains were integrated into subsequent buildings. The foundations of the castle buildings are to a large extent identical to the surrounding castle wall.
These remains give us a good idea of how the castle might have looked during the 12th century.