I KNOW THERE IS A SITE CALLED TARA, YE GREAT EEDIJIT
One thing I've noticed at megalithic sites is that people very clearly still have a strong urge to leave votive offerings. Take a look into the cavities eroded into the surface of the stone and you'll invariably see that someone has recently placed something there - a button, a 2p, a bird's skull, a smooth pebble, a snail shell, a flower, a nut, a fungus...
My mates and I used to walk out to this crag to pick 'shrooms back in the day. We could never be arsed to walk all the way back though, we'd just call a taxi out to the middle of nowhere and say we were hiking or whatever. We found some horrible looking British porn on VHS in my mate's older brother's room once and decided to take it with us and leave it stood on top of a rock like a little monolith.