I often wish I could see a "Streetview" from 10, 20, 30, 40, etc. years ago. It would be interesting not only in cities, but even to see how areas outside of cities morphed over time. Of course there are examples but, especially when taking a photo cost real money, there wasn't a lot of systematic documentation of mundane street scenes.
There are some examples here from NYC http://petapixel.com/2014/04/04/pictures-ny-storefronts-docu... but this sort of thing is uncommon.