A World Heritage site it is made up of a stone circle within a bank and ditch and two smaller circles within that.
Built roughly between 2850 BC and 2200 BC it is managed by the National Trust on behalf of English Heritage and unlike Stonehenge it is free to enter the site, and you can wander among the stones. Indeed, many sheep were doing just that when we visited!
The monument stands on a low chalk ridge and provides some lovely views of the surrounding countryside.
Definitely worth a visit, it’s a very extensive site and makes for a lovely walk.
You can find more photos here.