CartoDB is a great platform that allows you to map data and develop location aware applications quickly and easily. In CartoDB's demo gallery you can find this example of John Snow's Cholera Map of London presented with CartoDB.
The map demonstrates how CartoDB is able to quickly combine different data-types and display them on a map. John Snow's spot map of a cholera outbreak in Soho, London in 1854 helped to prove that the disease was caused by water (coming from one pump in Broad Street).
If you want to see John Snow's original map using the Google Maps zooming and panning tools then you should check out Hypercities.
Hypercities is a Google Maps mashup of historical maps available for many of the world's cities. Hypercities allows the user to navigate a selection of historical maps using the familiar Google Maps navigation tools. If you zoom into London on Hypercities you can choose to view John Snow's map overlaid on top of the modern map of London.
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