At his Facebook page, Daniele Rossi has posted some great 1920s-1930s aerial photographs of Toronto, from the Toronto Archives.
You can access the link here.
If you know of other such links of interest, please let me know. Because of the time that I devote to other projects, at this point in my work I tend to steer clear of archives. It would take up too much of my time to start to explore them. But I’m happy to post links that other people find.