Developer Dan Vanderkam collaborated with the New York Public Library to plot a collection of old photos from the Photographic Views of New York City, 1870s-1970s on an interactive map.
The project, called OldNYC, lets you browse 19th-century New York as easily as you would click around on Google Maps. The collection contains over 80,000 original photographs. Hit the red dot on the map to see a photo (source: TechInsider).
