An excellent video from the 80s on urban spaces:
16 December 2014
The vimeo link seems to be down, so here's a local mirror of the file: William H. Whyte - Social Life of Small Urban Places.avi. As far as I can tell it's the full video, running to 58 minutes 15 seconds. For best results right-click and save the file, don't try to watch it in your browser.
There's also a copy on archive.org: https://archive.org/details/SmallUrbanSpaces.