Dun Borrafiach is an Iron Age broch located on the Waternish peninsula of Skye. It occupies a rocky outcrop overlooking the Borrafiach Burn. Dun Borrafiach has an external diameter of 16.5 metres, and the walls still stand to a height of 2.7 metres on the south side. The entrance is on the northwest side of the broch. The northeast side of the entrance-way appears to have been narrowed in antiquity by the insertion of additional walling. Inside the broch, a long stretch of the outer face of the intramural gallery is still visible on the east side.
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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.