Wauwilermoos was an internment camp and prisoner-of-war penal camp in Switzerland during World War II. Established in 1940, Wauwilermoos was a penal camp for internees, including Allied soldiers, among them members of the United States Army Air Forces, who were sentenced for attempting to escape from other Swiss camps for interned soldiers, or other offences. Together with Hünenberg and Les Diablerets, Wauwilermoos was one of three Swiss penal camps for internees that were established in Switzerland during World War II. The intolerable conditions were later described by numerous former inmates and by various contemporary reports and studies.
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.