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Just click on the photo anywhere and it will become 2014. Click again and it will go back to 1944; or you can left click and hold on each photo, and then drag your mouse gently from left to right on the original photograph and it will be become a photo of the exact same location and view in 2014. Drag it back to the left and you are back in 1944!
I´m glad you all found it interesting. It was sent to me by an American friend who has a professional interest in photography. I thought it was fascinating.