De Wallen (Dutch pronunciation: [də ˈʋɑlə(n)]) or De Walletjes (Dutch pronunciation: [də ˈʋɑləcəs]) is the largest and best known red-light district in Amsterdam and a maallen consists of a network of alleys containing approximately three hundred tiny one-room cabins rented by prostitutes who offer their sexual services from behind a window or glass door, typically illuminated with red lights. The area also has a number of sex shops, sex theatres, peep shows, a sex museum, a cannabis museum, and a number of coffee shops that sell marijuana. 26 coffeeshops in the De Wallen area will have to close their doors between 1 September 2012 and 31 August 2015. As part of new restrictions which came into force in 2012, a Dutch judge ruled tourists can now legally be banned from entering cannabis cafes.[2][3]