Christiania -- This hippie-run "free state" in Copenhagen has a "green light zone" where they sell cannabis. It's illegal, but the occasional busts seem to be aimed mostly at the dealers, which is why there are these rules: have fun; don’t run (might be a raid!); no photos (might be evidence!). I hear you may now be able to take photos, but it's probably good to be discreet. https://www.visitcopenhagen.com/copenhagen/culture/alternative-christiania.