Smithsonian has an interactive map in which a satellite image of New York is overlaid with a map drawn by cartographer Joseph Colton in 1836. Moving the earlier map around, you can see that the streets are mostly in the same place, but the shorelines have expanded, the islands are bigger, and there is no Central Park -in fact, a lot of the city was countryside and hills back then. Read more about it at the interactive site. Link -via Digg