Dutch historian Jo Hedwig Teeuwisse has created some truely amazing photo mash ups with her Ghosts of War photo series. It takes old photos from World War II and superimposed them on top of modern photos taken from the exact same spot, decades later.
I've seen this method before in photos from the 1906 San Francisco Earth Quake, although these war photos are arguably more haunting. I've picked out some of my favorites below. After years of hearing the stories and legends of the second world war, these photos really make me feel closer to history, and these events so much more "real".