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Castlerigg Stone Circle - Keswick - Cumbria - <br />
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The stones are of a local metamorphic slate, set in a flattened circle, measuring 32.6 m at its widest and 29.5 m at its narrowest. The heaviest stone has been estimated to weigh around 16 tons and the tallest stone measures approximately 2.3m high. <br />
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The circle was probably constructed around 3200 BC, making it one of the earliest stone circles in Britain and possibly in Europe