@George,
It's at the bottom of the outer wall. You have to lie down, and lean back (there's someone there to hold you), and tilt your head back to kiss a stone on the inside of the highest outer wall. I can't say it conferred any gift on me, but my grandmother was born in County Cork, and she seemed to think i should do it, so i did, just to please her.
I didn't get any more words out of it, though. There's too many already.