The attempt by the government to decriminalize marihuana in Holland resulted in a wide spread distribution of cannabis.
The so called COFFEESHOPS are the most common outlets for the product
The cannabis leaf prominently displayed on the windows used to be the best indication for people to see where marihuana was sold.
Even though Amsterdam's city council has forbidden the use of the now internationally known symbol, it is still is not hard to recognize coffeeshops. The display of pipes and tobacco papers, the rastafarian red,yellow and green 
and above all the smell of sensimillia
all indicate that you can buy the product you want without fear of being caught.
Amsterdam is much more tolerant towards 
softdrugs than other cities around the world.