Berlin

I'm in Berlin right now and will be for a week. Do you have any tips what to do or see? I'm thinking maybe tattoorelated, or artrelated. I would very much like to visit Buena Vista Tattoo Club, who does the trash polka style that I like very much - but it would feel awkward to just walk in there I'll probably walk slooowly by and try to get a good look

If you have any tips of that kind, or any other tips, I'd appreciate it

Music shops or other musicrelated tips are also welcome!