Hjularöd Castle was first mentioned in 1391, but the current castle was built in 1894-1897. It was built on command of the former owner, chamberlain Hans Gustaf Toll. French medieval castles, the château de Pierrefonds in particular, were inspiration for the castle when architects Isak Gustaf Clason and Lars Israel Wahlman designed it. Outside scenes from the television series Mysteriet på Greveholm (The mystery at Greveholm) in 1996 were filmed in the courtyard of the castle. The castle since 1926 is owned by the Bergengren family and is not open for the public.
References: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.