Avebury Stone Circles

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Two further stone circles, both with diameters in excess of 330ft/100m, flanked the holy of holies, the inner sanctuary. Enclosed by the northern ring was a U-shaped arrangement of huge stone blocks, while the southern ring encircled equally large stones in a Z-shaped configuration. Archaeologists have estimated that 200 men working 60 hours a week for three years would have been needed to construct the vast complex. The site fell into decline after about 1,000 years, later generations using it as a source of building materials.