People are always finding clever ways to use Google Maps. The excellent Londonist has mapped the sites where V-2 rockets struck London between September 1944 and March 1945. According to Wikipedia, 1,358 rockets were fired at London. Around 9,000 Londoners died, an unthinkable number, though less than half the estimated 20,000 concentration camp inmates killed making the V-2 in the first place. A happier, and more practical, map overlays London's Tube lines onto the map of the city. I remember seeing a geographically-accurate Tube map when I was a kid and being fascinated by how different it was to Harry Beck's famous version. The Google version is fun to explore. Note in particular how badly-served we south Londoners are.
We bore the brunt of the V-2's too. It's tough in south London.