After the 4-hour Real Berlin tour (daily at 12:00, €12) you'll know all about Berlin's subcultures, the graffiti and stencil art, street artists like Thierry Noir and Mr.6, the gay scene, and the squatter and anti-fascist movements. Knowledgeable resident artists poke at Berlin's dark, fuzzy underbelly on a variety of walks; there are also free short walks (daily at 11:00 and 13:00), twilight tours, a street art workshop and an 'anti-pubcrawl'.