Silbury Hill is the largest man-made prehistoric mound in Europe. It was built roughly at the same time as some Egyptian pyramids, approx 2,400BC, and is about 130 feet (39 metres) high and 1,640 feet (500 metres) round. Its purpose is completely unknown.
Silbury Hill can be viewed from a path between Avebury and the A4 at West Kennet, but, to prevent damage, there is strictly no access to the hill itself. It is part of a prehistoric landscape that includes Avebury Henge, stone avenues and burial chambers.