Chris (above) is right - the Wheeldale stones. I was wrong about where they are, south, north, bejabers. Are you anywhere near Oldham? Or, particularly, Tunstall? There was one, or maybe two, that you could see from the M62 in the golf course. They've gone missing in the last three or four years but are possibly just pushed over. I could work out a position for them from GoogleEarp, but it would take a while ...