The London Museum teamed with agency Brothers and Sisters to launch Streetmuseum, an iPhone app that allows you to see into London's past. The app takes hundreds of images from the Museum of London's collections and overlays them onto their real-life locations. Users can pick a location from a London map or use GPS to locate a nearby image. By holding their phone camera up to the scene, they can see the same site as it appeared years ago, along with the history behind the historical image.
The app is available on iTunes in the U.K.