Ninety miles west of London and twenty miles north of Stonehenge stands Avebury, the largest known stone ring in the world. Older than the more famous Stonehenge, and for many visitors far more spectacular, the multiple rings of Avebury are cloaked with mysteries which archaeologists have only begun to unravel.

Similar to Stonehenge and many other megalithic monuments in the British Isles, Avebury is a composite construction that was added to and altered during several periods. As the site currently exists, the great circle consists of a grass-covered, chalk-stone bank that is 1,396 feet in diameter (427 meters) and 20 feet high (6 meters) with a deep inner ditch having four entrances at the cardinal compass points. Just inside the ditch, which was clearly not used for defensive purposes, lies a grand circle of massive and irregular sarsen stones enclosing approximately 28 acres of land. This circle, originally composed of at least 98 stones but now having only 27, itself encloses two smaller stone circles. The two inner circles were probably constructed first, around 2600 BC, while the large outer ring and earthwork dates from 2500 BC. The northern circle is 320 feet in diameter and originally had twenty-seven stones of which only four remain standing today; the southern circle is 340 feet across and once contained twenty-nine stones, of which only five remain standing.

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