Leaflet.org

I’ve probably seen over 100 modern interactive visualizations of John Snow’s famous map of cholera victims during the 1854 cholera outbreak in Soho. John Snow’s map shows the locations of cholera deaths clustered around a water pump in Broad Street. The map helped to disprove the prevailing miasma theory on the spread of diseases and establish that cholera was actually spread by contaminated Maps Mania… more →