This ancient ring of stones is situated near the village of Callanish (Gaelic: Calanais) on the west coast of the isle of Lewis.
Construction of the site took place between 2900 and 2600 BC, though there were possibly earlier buildings before 3000 BC. A tomb was later built into the site. Debris from the destruction of the tomb suggests the site was out of use between 2000 BC and 1700 BC. The 13 primary stones form a circle about 13 m in diameter, with a long approach avenue of stones to the north, and shorter stone rows to the east, south, and west (possibly incomplete avenues). The overall layout of the monument recalls a distorted Celtic cross.
The first written reference to the stones was by Lewis native John Morisone, who in c. 1680 wrote that “great stones standing up in ranks […] were sett up in place for devotione”.
The tallest of the stones marks the entrance to a burial cairn where human remains have been discovered. An excavation campaign in 1980 and 1981 showed that the burial chamber was a late addition to the site, and that it had been modified a number of times. Pottery finds suggested a date of 2200 BC for the erection of the circle. It has been speculated, among other theories, that the stones form a calendar system based on the position of the moon. Professor Alexander Thom suggested that the alignment of the stone avenue (when looking southward) pointed to the setting of midsummer full moon behind a distant mountain called Clisham.
Local tradition says that giants who lived on the island refused to be converted to Christianity by Saint Kieran and were turned into stone as a punishment. Another local belief says that at sunrise on midsummer morning, the “shining one” walked along the stone avenue, “his arrival heralded by the cuckoo’s call.” This legend could be a folk memory recalling the astronomical significance of the stones.
-Text from en.wikipedia.org
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