I always enjoy reading this Sankey diagram (a type of flow map) on the French invasion of Russia by Charles Joseph Minard in 1812:
Charles Joseph Minard's famous graph showing the decreasing size of
the Grande Armée as it marches to Moscow (brown line, from left to
right) and back (black line, from right to left) with the size of the
army equal to the width of the line. Temperature is plotted on the
lower graph for the return journey (multiply Réaumur temperatures by
1¼ to get Celsius, e.g. −30 °R = −37.5 °C).
(click on image to zoom)
In 2nd position, this 3D pie makes me laugh each time I see it:
It is the perfect example of how misleading a 3D visualization can be: Steve Jobs clearly used a 3D pie chart to make Apple's market share look much larger than it was:
The 19.5% market share slice for Apple's iPhone somehow looks bigger
than the 21.2% market share for the mish-mash of "Other" brands.
Same Steve Jobs 3D trick on another slide: