Kubrick filmed A Clockwork Orange in and around London, but you won't find the Korova Milk Bar and its obscene tables anywhere in the streets of that fair city. That was one of the only sets built for the film. The rest of the movie utilized real-world locations, from the Marina where Alex dumps Dim in the water to the record store (which is now a McDonald's).
Although you can visit many of the film's locations—and even order a Big Mac in one—it's not quite the same as what's in the movie. The film shows us Alex's London, and the devious droog is in almost every shot of the movie. We see London as a futuristic thug might. In every corner lurks an opportunity for ultra-violence and trouble.