has 2 claims to fame:
- U2 recorded many albums there.
- It is the one place you can spray-paint to your heart's content without risk of arrest.
Because U2-related graffiti has accumulated there for so long, a sort of 'blind-eye' is turned to it.
Of course, every now & then a fuss is made and the graffiti is removed. But it always tends to come back.
It seems a good idea to a place set-aside like that. Gives a legitimate outlet to those who simply MUST tag their name. Better there than on the side of some house or shop!