| http://www.w3.org/ns/prov#value | - Around it are 300 post holes measuring two metres wide, indicating a massive human effort involved in the construction.We think it probably dates from 2500 to 2300BC and still had a big physical presence even after the posts were taken out or rotted, Mr Newman said.While the monument is located just below the ground's surface, there are no plans yet to dig it out.There was a time when excavatio
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