Humans are gone. The city remains. 23 Skidoo is a beautiful and chilling 1964 short, by Julian Biggs, from the NFB’s beta screening room. Wonderful sound track (Kathleen Shannon and Ted Haley) to go along with the lonely images.
For those wondering, “23 skidoo” is a slang term from the 1910s meaning, more or less, to leave suddenly (so says Wikipedia in any case).