I have stumbled upon this photographer, Branson De Cou. I don't really know who he is, except what's important: he photographed Italy during the 1920s and 1930s and now there is an archive in California, online.
Here is the image index.
De Cou worked in the format of lantern slides. This means he is photographing on glass plates, which, when processed, form a transparent positive (like slide film), and were to be projected creating life size images. De Cou apparently contracted four different painters to color his images.
What I notice is that I feel not much has changed (which is odd, considering Italy was leading up to a fascist regime at the time of the photographs). The architecture remains, the roads are the same. More cars, more people, more street vendors. Same people, same color, same smiles.
per essempio (De Cou siena v. my siena),
Allora, some cities to note of course are: