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http://oldmapapp.com/

Found this today and thought it seemed cool. Entirely NYC focused at the moment it seems....



From the website:

Old Map App allows an iPhone user to explore the effects of time on geography and urban development.

The application displays layers of geo-referenced historical maps projected onto a modern coordinate system, so that the same location can be compared over time. Layers can be faded, adjusted, and explored freely. If the user is located within the region of the historical map, the user's position will be mapped on the old maps to the position of the compass indicator.

Several maps of New York City & Region are included from the 17th to 19th centuries. All are high-resolution scans from the Library of Congress.

http://oldmapapp.com/