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A dry stone circular tower of the late Iron Age, common in the north of Scotland, very rare in the south. The surrounding was built solid at the ground level, while higher up the wall it divided into a number of chambers and galleries. The small doorway through the base of the wall was easily defensible. The design of the broch showed a need to build upwards rather than outwards, so at to reduce the size of the perimeter so that fewer people were needed to defend it. (N. borg. fortress).
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