Hohes Schloss (High Castle) in Bad Grönenbach was built originally in the late 12th century. The latest remaining parts where built around 1280 by Heinrich Ludwig von Rothenstein. It was enlarged in the 14th century.
In 1482 the castle was acquired by Pappenheim family. It was besieged and damaged during the Peasants' War in 1525 and conquered by Bayern and French armies in 1703 during the war of Spanish Succession.
Today Hohes Schloss is used for events, guided tours etc.
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.