Interesting bit about the naming:
Although the Callanish Stones in Lewis, are often referred to as Clachan Chalanais, the correct term (and the one found on signs) is actually Tursachan Chalanais – pronounced Toor-sakh-khan Khalanish.
Over the years, there have been various attempts to explain the meaning of Tursa in this context. Theories ranged from theorising that since the stone circle was a solemn place it must be related to tùrsach, meaning sad. Others attempted to link it to the word turas, meaning journey, because pilgrims might travel there. Scholars believe it is related to the Old Norse word Tursa, which meant giant, because the stones, especially the central ones, do tower over people. The current Gaelic name of Calanais is much more recent than the stones themselves.
More at
http://caledonianmercury.com/2010/11/08/useful-gaelic-word-clach/0011755
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