Legal walls worldwide: map

Everyone: Be careful not to post walls that will be ruined by tourist traffic. Unless you are intimate with a particular wall's situation, don't blow up the spot for the people who paint there!

Writers: No wall is arrest-proof, because some police are not very interested in permission walls, so please keep that in mind when you plan what to take with you and what to say if confronted. Be good guests and take your litter with you. If you tag nearby buildings, the wall will soon be ruined and everyone will know who ruined it.

Photographers: Graffiti is covered by copyright, so don't think you can go to a wall to do commercial photography and get away without obtaining the artists' permission. It's much cheaper to make advance arrangements.