Leningrad, Then and Now

Stumbled upon these very cool photos that combine the past and the present in a very creative way.

Leningrad, then and now:
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!