Charles Mindard's flow map of Napoleon's failed march on Russia. One of the finest infographics ever.
Jonathan Nelson stashed this in Data is Beautiful
Source: http://imgur.com/ZOGd6Yd
Stashed in: Visualization, Infographics!, Russia and Friends, Maps!, Mind Blown!
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What makes this graphic so unusual is that he's able to depict six dimensions of data with only two dimensions of visualization.
"Defies the pen of the historian in its brutal eloquence":
http://en.wikipedia.org/wiki/Charles_Joseph_Minard
Additional info:
Tufte on Minard's sources, Minard's biography, an academic summary, and re-designs of the chart.
12:42 AM Apr 17 2013