I was out on a run today and came across an old ruined chapel and graveyard. It's very scenic and well maintained. St Bride's chapel near Loch Gair in mid Argyll.
When you go in, there is a round by flat-ish rock on top of the chapel wall and a brass sign under it saying "Turn the stone on entering the graveyard"
I assume some sort of superstition, but not one I have ever heard of. Anyone got any ideas as to why and what exactly the superstition is?