Having been brought up on pictures of Stonehenge, I felt a little twang of confused letdown the first time I visited Thornborough. This passes quickly though, and if you're vaguely near North Yorkshire it's well worth a visit. I've had the pleasure of camping at the base of it a few times with fire and mead which makes it all the more fun.

https://en.wikipedia.org/wiki/Thornborough_Henges