There are over 100 rock carvings depicting rich and wide variation of themes in Torsbo, including the longest boat carving in Sweden (4,5m). There are also figures of a tree, and several warriors carrying swords. Many of the warriors are depicted as having enlarged calves, a feature that is typical for this area. It cannot be rulled out that several of the carvings were made by the same person. The carvings as a whole have, however, been made over a period of some 1000 years. Many of the ships date from the early Bronze age, around 1800-1500 B.C. while most of the warriors are thought to date from the end of the Bronze Age, around 700-500 B.C. There are often features of both motifs on the same rock face, indicating that the place was used and was a holy place for many generations.
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.