This is interesting. I've never heard of it. Apparently it was discovered in 1999.
From the BBC:
![](http://news.bbc.co.uk/olmedia/385000/images/_388988_heng300.jpg)
Larger picture from a website detailing neolithic sites in the UK:
![](http://easyweb.easynet.co.uk/~aburnham/eng/seahenge1.jpg)
Thanks for the image. It has just replaced Xerxes Canal as my wallpaper of the day.
I can see Spinal Tap trying to use one of these.