Hiltenburg Castle in the Upper Fils Valley stands on the strategically advantageous, 707-m-high conical mountain peak of the Schlossberg, overlooking Bad Ditzenbach. Up until the 16th century it was the seat of the Counts of Helfenstein. In 1516 it was destroyed by Duke Ulrich of Württemberg, who was passing through on his way from Blaubeuren to Stuttgart. A cannonball from the Hiltenburg happened to land in Ulrich's camp, and this caused the Duke, who was known for his extremely hot temper, to have his men burn down the castle. The extensive complex is at present undergoing renovation.
Two vaulted cellars have been excavated, and archaeological finds attest that the Hiltenburg site was already populated as far back as the Bronze Age (c. 1000 BC). From the observation platform of the Hiltenburg's tower hikers can enjoy magnificent views of the Upper Fils Valley.
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.