(Aerial of Manhattan Around 1931)
One of the more interesting mapping sites about New York traces patterns of change over various periods of The City’s history; From it’s earlier industrial roots and into the 21st Century. An amazing resource for those interested in mapping and cartography; It can be found here at this NYC.GOV Website.
Hint to Navigate: Zoom in on the area you would like to see and click “Map Type” in the upper right portion of the screen to see the aerial at a certain time period. Enjoy!