In a 1963 interview with Peter Bogdanovich, Hitchcock talked about several unfilmed projects, including "Life of a City":
This is something I've wanted to do since 1928. I want to do it in terms of what lies behind the face of a city -- what makes it tick -- in other words, backstage of a city. But it's so enormous that it is practically impossible to get the story right. Two or three people had a go at it for me but all failed. It must be done in terms of personalities and people, and with my techniques, everything would have to be used dramatically.