Leningrad, then and now:
http://izismile.com/2009/02/27/leningrad_back_then_and_now_15_pics.html
http://izismile.com/2009/02/27/leningrad_back_then_and_now_15_pics.html
This makes me think of some interesting things one could do when visiting the hometowns and homesteads of our ancestors if you have an old photo to refer to!