At the end of my quiet little street is a small, unassuming store called The Sacred Seed. Despite its claims to be an "exotic seed and houseplant shop specializing in medicinal, rare, and otherwise intriguing plants" it carries a wide range of cannabis seeds including varieties such as Island Sweet Skunk, Afghani Special Indica, and Swiss Bliss (take that Swiss Miss!).
I've walked past the store just about every day for the past year. About six months ago I noticed that they had started flying a really interesting flag in the window. Today I stopped and ask the owner and discovered that it was the official flag of Amsterdam. Apparently the three "St. Andreas crosses" represent the three dangers that have traditionally plagued the city: flood, fire, and pestilence and no one is quite sure where the black and red colors come from. More on the flag can be found on this site and at the Wikipedia. Big points to Amsterdam for a bad-ass flag.