Scientists find Stonehenge's larger neighbor

Large stones dating back 4,500 years measuring 15 feet long were found about 3 feet underground.

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Researchers said the discovery that it is on "an extraordinary scale" and unique, the BBC reported.

Experts believe that the site, which has not been excavated, to be a Neolithic ritual site that surrounded springs and a dry valley leading to the River Avon, the BBC reported.

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