SUPERIMPOSING a historic photo on an up-to-date snap of the same scene is a neat way to bring history to life, as the website historypin.com demonstrates.
If you want to take a modern photo that will contrast effectively with its historical counterpart, though, you need to ensure it is taken from the same spot, and with the same zoom level. If you don't, the combined picture ends up looking disjointed, with roofs, walls and roads poorly matched.
http://www.newscientist.com/article/mg20727704.200-camera-app-puts-you-in-the-footsteps-of-history.html
