Outstanding tour taking you to places you would never find yourself. Loads of street art, scorching graffiti. Abandoned places, funky shops, markets. Hidden neighborhoods and cultural icons. These are the places locals go to. You'll hardly see a tourist all day. They offer a brilliant night tours as well: bars/clubs/secret spots. These guys know their stuff.
Begins at Alexanderplatz TV tower
www.alternativeberlin.com
Can't praise this tour highly enough. I did the four hour tour during the day and the anti-pub crawl at night - fantastic time with fantastic guide. Don't miss it if you want to see a different side of Berlin.