Along with Newgrange in Ireland, Stonehenge in England and the Ring of Brodgar in the Orkneys, the tumuli, alignments and single standing stones of Brittany are of pre-eminent status among the megalithic sites of Europe. Dated at 5700 BC, the tumulus of Kercado at Carnac is the earliest known stone construction in Europe. Little is known of the monuments’ creators; the few skeletons unearthed indicate a short, dark, hairy race with a life expectancy of no more than the mid-30s. What is certain is that their civilization was long-lasting; the earliest and the latest constructions at Carnac are more than five thousand years apart.

Each megalithic centre had its own distinct styles and traditions. Brittany has relatively few stone circles, or cromlechs, and a greater proportion of free-standing stones, menhirs; fewer burial chambers, known as dolmens, and more evidence of ritual fires; and different styles of carving. Carnac’s alignments are unique in their sheer complexity. As for their actual purpose, the most fashionable theory sees them as part of a vast astronomical observatory centred on the fallen Grand Menhir of Locmariaquer. However, controversy rages as to whether the Grand Menhir ever stood at all, or, even if it did, whether it fell or was broken up before the surrounding sites came into being. Moreover, sceptics say, these measurements ignore the fact that the sea level in southern Brittany 6600 years ago was 10m lower than it is today. Alternative theories interpret the menhirs as a series of territorial or memorial markers. This annual or occasional setting-up of a new stone is easier to envisage than the vast effort required to erect them all at once – in which case the fact that they were arranged in lines, mounds and circles might have been of peripheral importance.

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