It's the largest circle in England. Thought to date from around 2500 BC, it is a large earthwork bank and ditch surrounding a circle of standing stones.
The bank is around 450 yards in diameter, and its ditch was originally 30 feet deep
The standing stones comprise an outer circle and two inner circles, known as the northern and southern circles. These inner circles are believed to have been built first, with the outer circle and the surrounding earthworks being added around a century later.
The outer circle has four "gates" at roughly north, south, east and west. From two of these gates ran two great avenues. Only the West Kennett Avenue from the southern gate survives, and a small section of it has been reconstructed with a border of standing stones to show what it looked like. Originally this avenue led to the Sanctuary on Overton Hill.
Or so they reckon - personally I think God planted them to give the pagans something to dance around 
All my life I've wanted to be someone; I guess I should have been more specific.