Oh I'm sure that they are. (grrrr) I'm also sure that ancient sites are still used in positive ways as well - when I was in Hadrian's Wall country I came across a very small ruined temple of some sort where people still left offerings of flowers. I think Stonehenge attracts more attention because it is so famous.
At the same time, there are also the folks who think they are doing us a theological favor. Here in the states a lot of university libraries have problems with people stealing and destroying any books relating to ghosts, witchcraft, etc. on the ground that they will encourage Satan and his various minions... possibly also gum disease.