I hope this link works. Shows a 1940 photo. Click on the photo and it shows the same view today. I thought this was very interesting.
https://interactive.guim.co.uk/embed/2014/apr/image-opacity-slider-master/index.html?ww2-dday
https://interactive.guim.co.uk/embed/2014/apr/image-opacity-slider-master/index.html?ww2-dday