Who destroyed the stones? Today, the Avebury (Wiltshire) megaliths attract many visitors. The stone circle and the avenues are among the largest prehistoric monuments of their kind in Europe, and are protected as valuable assets to the community. It was not always so. It may not be obvious to the casual observer, but many of the stones have been lost. Over the millennia, they have suffered much wear and tear, but between the 14th and early 20th centuries many were deliberately destroyed.