Gamburg Castle was built in the mid-12th century by arcbishops of Mainz. Unlike many other castles, Gamburg was indeed renovated several times, such as during the Renaissance, but it was never destroyed and was continuously inhabited. Even during the Peasants' War, it remained intact thanks to the personal intervention of Götz von Berlichingen, making it one of the few castles to do so.
At the center of the castle complex with an almost oval layout stands the Romanesque keep. Surrounding the inner courtyard are the former stables, the so-called Forester's House, and the opposite 'castle,' consisting of the chapel tower, the great hall (Palas), the Middle Building, and the Rear Building, which has housed a chapel since 1921. The inner castle was surrounded by a fortification with six semicircular shell towers, a round corner tower, an outer gate with two round towers, and the moat later transformed into a baroque castle park.
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.