Streetmuseum is a new (and free) augmented reality iPhone app created by the Museum of London that allows you to browse historical photographs in various parts of the city.

The app leads you to various locations around London using either the map or GPS. Once you’re there, click the “3D View” button, and the app will recognize the location and overlay the historical photograph over the live video feed of the real world, giving you a brief glimpse into how the past looked.

We’ve seen projects that overlaid historical photos over modern ones, but this is the first time we’ve seen an augmented reality app do it for you in real time. Here are a few more examples:

If only this were available in every big city around the world.

Museum of London – Street Museum (via Creative Review)