The new circle - which has been named Na Dromannan - overlooks the Standing Stones of Callanish.
It's thought it collapsed because it was built on an unsteady surface of rocks.
The stones were found lying broken where they fell.
Some of them originally measured four metres long and the stone circle was pretty big at 30 metres wide.
Stonehenge
Stonehenge is at the other end of Britain - in Wiltshire in southern England.
It is thought to have been built in about 2000 BC.
It has puzzled archaeologists for centuries, but it's thought it was used to watch the movements of the sun and the moon.
Hear story 
Talk about this now!
Stamp out vandalism!
