Faerie rings, where faeries and witches gather to dance and sing which makes it a very dangerous place to step in unaware.
If you are drawn inside you can only escape the dancing faeries if a human chain pulls you out of the ring. You will lose all sense of time and what might seem like minutes could have been hours.
But this is the down side of faerie rings...if you run around a faerie ring nine times under a full moon this will enable you to see and hear the faerie but do not do it on All Hallow's Eve or May Eve as these are very important faerie festivals. They would be very offended and carry you off to faerie land.
If you would like a wish granted, stand in the middle of the ring under a full moon and it will come true.
It is said that beneath the faerie rings gold lays buried and if you dig deep enough it can be retrieved; however I am pretty sure that the faeries would be a bit peeved and goodness knows what would happen!
Faeries and Folklore of the British Isles