Staring Through a Wormhole in New York

The Smithsonian has found a strange wormhole in New York through which you can stare back to 1836.

The Smithsonian & ESRI History Maps are a series of maps combining historical maps from the David Rumsey collection with Esri's modern aerial imagery. Each of the maps includes a neat magnifying glass tool that allows you to view the modern day aerial image through the historical map. You can even switch the views around and compare the historical map on top of the modern aerial imagery.

The series includes historical maps of a number of US cities, including New York, San Francisco, Chicago, Washington DC, LA and Denver.