I have no idea where you are currently, but that was a picture of the US mint. And for you amusement, Google says it is Dr. Christian Santana, DDS. Don't ask because I have no idea why.
Problem is that the stone is so close to the fence, that no matter what you put on it, anyone can just reach through and take whatever they want. Beside, who was it that said, "A penny saved is a penny earned"? It seems kind of like a slap in the face to leave pennies on this particular grave stone. Just sayin'...