When technology meets photography, handled by creative minds, this is what you get : The Museum of London has just launched an iphone App that mixes the present with the past.
Works only in London, for now : You point your iphone camera to a location and you can click on the “3D view” button and the app will recognize your location and overlay the historic image over the current view. See examples below. Of course they do not have an images for everywhere you go, so they give you a map where you can play with this historical enhance reality.
It’s free to download so if you are in London, and you have an Iphone, you should really try it.