Spine Castle was built in the late 12th century and destroyed in 1348. In the 16th century the castle ruins was converted into a hunting lodge. In 1933 a serious fire almost led to complete destruction, only the southern buildings were saved while the other wings collapsed and were never rebuilt.
Today only part of the castle is habitable while the rest lie to ruins, although impressive. Spine castle is not open to the public.
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.