If I could turn back time ...
Drawing on the world's largest online collection of geo-coded historic maps, Historic Earth allows you to virtually travel back through time in many locations. Geo-coding allows the maps to closely overlay a modern map, so that the same locations can be compared in various time periods. Historic Earth allows you to map the history of cities, times, buildings and landmarks. View historic maps showing property owners, see buildings constructed and replaced, and watch the landscape change over time. [...]
Read more: http://emergencestudios.com/historicearth/