I'll be out all day at the Middle East Institute's Annual Conference. Those of you in the DC area should come on down. (Admission to the Conference is free; only lunch is a paid event and there are plenty of dining options nearby.) If you're not around these parts it will be online fairly soon, and to keep you engaged I thought I'd drop in some YouTube videos of Cairo from the 1920s to 1979 or so. Enjoy.
1920s (caption says 1930s but it looks earlier to me):
1950s, probably early in the decade:
1956, with a view of the old Opera House before it burned:
This video has dropped off twice so I'm excluding it for now.
And a documentary on early Helipolis which, amid the talking head memories and a slightly hokey time-travel-by-train framing story, has some old stills and videos interspersed.