Thanks to archivists around the world, photos of past times and places are making their way to Google Earth through "historical imagery" feature. Once enabled, you can scroll back and forth through time to make and unmake history with your fingertips.
To view London in 1945, just start Earth and type London as destination in upper left. Then, click clock icon to enable historic imagery. Scroll back to 1945.
Turning back 66 years of visual history is also possible in war-time Paris, France. Here, you can see monuments to Napoleonic-era victories during war-time occupation, and study scenes of everyday life in those historic times.
You can see both, not only via aerial viewpoints but also in Street View images in" Earth and Maps. For Earth, enable Street View layer in lower left; and in Maps, drag Pegman onto your viewport when you're looking at most anywhere in France or UK.