The funny thing is that Stonehenge isn't strictly speaking a henge. A henge is an earthwork with a ditch inside a banked earth wall. There might or might not be stones inside the the earthwork.

Additionally funny (and ironic) that the term "henge" comes from Stonehenge, even though Stonehenge is technically not a henge.

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