Anyone who has taken the sea road of the Eilean Siar (Western Isles), or skirted the high edges of Caithness and Sutherland, or meandered the archipelagos of Shetland and Orkney, will have noted a peculiar structure, often wore down to its foundational stump like an old tooth - the 'broch'. These blind eyeless towers once stood proud of the landscape on our northern Celtic coastlines (the tallest remaining is the Mousa Broch of Shetland), from around 300 BC through the Iron Age until they were either 'inherited' by invading Vikings and occupied until around AD 1300, or 'unquarried' for walls and other structures. It was the vikings who have given us their modern name from 'Borg' meaning 'fortification', though what they were called by their original architects swims in the deep Celtic well of lost tongues. It is unlikely, however, they were originally built in response to insecurity. Their frequency, such as in the northern peninsulas of Skye