or sunny, but quote you a figure from the Beaufort Scale." There are gales one day in six at the Butt of Lewis and small fish are blown onto the grass on top of 190 metre (620 ft) high cliffs at Barra Head during winter storms. Prehistory The Hebrides were originally settled in the Mesolithic era and have a diversity of important prehistoric sites. in on North Uist was constructed around 3200–2800 BC and may be Scotland's earliest crannog (a type of artificial island). The Callanish Stones, dating from about 2900 BC, are the finest example of a stone circle in Scotland, the 13 primary monoliths of between one and five metres high creating a circle about in diameter. on South Uist, the only site in the UK where prehistoric mummies have been found, and the impressive ruins of Dun Carloway on Lewis both date from the Iron Age. History In Scotland, the Celtic Iron Age way of life, often troubled but never extinguished by Rome, re-asserted itself when the legions abandoned any permanent occupation in 211 AD. Hanson (2003) writes: "For many years it has been almost axiomatic in studies of the period that the Roman conquest must have had some major medium or long-term impact on Scotland. On present evidence that cannot be substantiated either in terms of environment, economy, or, indeed, society. The impact appears to have been very limited. The general picture remains one of broad continuity, not of disruption ... The Roman presence in Scotland was little more than a series of brief interludes within a longer continuum of indigenous development." The Romans' direct impact on the Highlands and Islands was scant and there is no evidence that they ever actually landed in the Outer Hebrides. The later Iron Age inhabitants of the northern and western Hebrides were probably Pictish, although the historical record is sparse. Hunter (2000) states that in relation to King Bridei I of the Picts in the sixth century AD: "As for Shetland, Orkney, Skye and the Western Isles, their inhabitants, most of whom appear to have been Pictish in culture and speech at this time, are likely to have regarded Bridei as a fairly distant presence." The island of Pabbay is the site of the Pabbay Stone, the only extant Pictish symbol stone in the Outer Hebrides. This 6th century stele shows a flower, V-rod and lunar crescent to which