John Snow's famous Cholera Map from 1854, updated to show off CartoDB's cloud based mapping tool.

John Snow's famous Cholera Map from 1854, updated to show off CartoDB's cloud based mapping tool.

The Ghost Map (a little public health and history mixed together)

The Ghost Map: Hard Lessons in Epidemiology from Victorian London

The Ghost Map (a little public health and history mixed together)

Dr. John Snow's map of the 1854 London cholera outbreak

Dr. John Snow's map of the 1854 London cholera outbreak

Original map made by John Snow in 1854. Cholera cases are highlighted in black.

Original map made by John Snow in 1854. Cholera cases are highlighted in black.

John Snow and a section of his famous map depicting the pumps in London contaminated by Asiatic cholera, 1848.  These cases were linked to a single provider of water for that pump, and spurred on numerous future attempts to use mapping to define causes for various diseases.

John Snow and a section of his famous map depicting the pumps in London contaminated by Asiatic cholera, 1848. These cases were linked to a single provider of water for that pump, and spurred on numerous future attempts to use mapping to define causes for various diseases.

John Snow's Cholera map as a heatmap in Power Map

John Snow's Cholera map as a heatmap in Power Map

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