In which city is 'Rocky' set?

In which year was 'Forrest Gump' released? In which year was 'The Dark Knight' released? In which year was 'Avatar' released? In which year was 'Gone with the Wind' released? In which city is the film 'Chinatown' (1974) set? In which city is 'The Untouchables' (1987) set? In which city is 'Home Alone 2: Lost in New York' mostly set? In which city is 'Sleepless in Seattle' partly set, besides Seattle?