Rammenau Castle was built between 1721 and 1735 by architect Johann Christoph Knöffel for Ernst Ferdinand von Knoch, chamberlain of king Augustus II the Strong. As Knoch went bankrupt with the immense costs of this project, Franz Josef von Hoffmann purchased it in a foreclosure auction in 1744. In 1879 it was sold to the von Posern family, with the last owner, Margarete von Helldorff née von Posern, being expropriated by the communists in 1945.
Today it is owned by the State Palaces, Castles and Gardens of Saxony and open to the public, housing a museum with period furniture.
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.