Personally I have simply asked kids if I see them to just stop, most are very good about it. They don't realize the extent and deep meaning that monument stands for .OR put up a camera, fake cameras work very well but IF The City is as CONCERNED as they say about damage to the Marble then for heavens sake DO SOMETHING. send THE 18 UNDER PARENTS A TICKED with pictures and they will stop. The Cop shop is right there , can't they just scan it occasionally send the police if there are people damaging the area. We seen to do a lot of complaining and meanwhile the damage done is done.