Avebury

Silbury Hill and the Fields Around It

The largest man-made mound in prehistoric Europe — forty metres of earth raised around 2400 BC. Why is unknown: excavation inside found nothing. In this subject it is known for something else: the fields around Silbury and neighbouring Avebury have produced more crop circles since the 1980s than anywhere else on earth. The figures appear overnight, sometimes a hundred metres across, sometimes mathematically elaborate. In 1991 Doug Bower and Dave Chorley demonstrated how they had been making circles with planks and rope since 1978, and the question of origin largely closed. The circles still appear every summer — made openly now, with some of the makers known by name.