Breitenlohe is well known is the castle from the 16th century. It was originally a moated castle, but the moat is dry. It has six towers, in two of them are staircases. Before the castle was built in 1569, there was already a kind of castle in the same place. The first castle was built in 1340 for Albrecht von Hohenlohe and later sold to the Family von Vestenberg, who renovated the castle and later rebuilt it. The 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.