Dun Hallin is an Iron Age broch located on the Waternish peninsula of Skye. Dun Hallin has an external diameter of around 17.4 metres and an internal diameter of around 10.5 metres. The broch walls currently stand to a maximum height of 3.8 metres on the north and west sides. The entrance is on the southeast side but is in a ruined state. On each side of the entrance passage are oval guard cells, although only the northern, right-hand cell can easily be seen. The interior of the broch is full of rubble, much of it grassed over. A mural gallery is visible on the southwest side and a lintel stone remains in position over the doorway there. Six steps of the intra-mural stairway were found when the broch was examined in 1921 but are not now apparent. The broch is additionally defended by an outer stone wall which runs round the edge of the rocky knoll and which is still about 6 metres high to the south. The broch has not been excavated.
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.