I just came across The David Rumsey Map Collection which is a collection of maps from the 18th and 19th century. Here you can search for maps by selecting a part of the world using google maps.
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Graphed history of the world
This one graph summarizes the history of the world in one long graph, covering 4000 years. What surprised me the most was that the Mongolians were quite strong twice, and I hardly know anything about them.
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