I was curious how big the Great Wall of China was compared to New York City. Turns out the entire Eastern Seaboard is a better comparison. BBC's awesome Dimensions site lets you map historical happenings over geography of your choosing.
Dimensions lets you size up great cities of history, environmental disasters, WWII battles, and more, with any landmass in the world. The results are often surprising.
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What a tiny little Moon you are! Or maybe I just haven't been giving Australia enough geographical credit? [BBC Dimensions via Kottke]