In the late 1400s Kulla Gunnarstorp was known as Gundestrup and it belonged to the Pardsberg family. In the mid-1500s it was acquired by Jörgen Brahe, who built the older castle which still exists. After him it has been owned by famous Sparre, De la Gardie and de Geer families. The newer castle was built by Baltzar von Platen in 1865-1868. This was designed by Danish architect Christian Zwingmann. Today the estate is private owned.
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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.