On the Ilam Estate, which, because it's owned by The National Trust, is open to the public for free, one finds this ancient stone well, not far from the estate church.
This 'well' is more of a large bath than the sort of place one might simply draw water.
St Bertram (aka Bertelin) is the local saint, and his tomb is in the church, so the water in this well has supposed healing qualities, and pilgrims would dip themselves in the freezing pool therein. If it didn't kill, it might have cured...
Nowadays, there is a small iron fence to act as a deterrent to bathers, but I daresay some do climb in.