Manhatten, Maps from Old to New

To copy a friend: "Awesome use of Maps."

From The New York Times:
"How Manhattan’s Grid Grew"
http://www.nytimes.com/interactive/2011/03/21/nyregion/map-of-how-manhattan-grid-grew.html

Compare an old map of Manhatten to a new map.  Amazing to see how true Manhattan has remained to its original plan.  Also interesting to see how Manhattan has grown, physically expanding around the edges.