If you look at the sidebar, you will find a link to Messy Nessy, who writes a really cool blog about Paris. Her most recent is about a photographer who has researched the locations of photographs taken during the liberation of Paris in August of 1944 and then shown them in overlay with a photo of the same location in present time. It's really worth the the few minutes to look at them. And know that several of these same locations now have memorial plaques for those who are "Mort pour France".
Here's the link.....http://www.messynessychic.com/2015/05/11/paris-then-now-a-city-on-the-edge-of-freedom/