Stonehenge - one that everyone will recognise. The stones were massive and it was very impressive. The birds didn't care about the fence around it and squabbled amongst themselves the whole time, perched atop the henge.
Woodhenge. The wood that made it up no longer remains; instead there are concrete posts to show where the wood would have been.
The Sone Circle in Avebury. There are huge circles that surround and are part of the village. This was only one small segment of it - in other areas there were different sized rocks and the village had been built around them.
And a very special henge: Sheephenge.