Can't exactly remember the layout of eastern Europe around the fall of the Soviet Union? A bit rusty on your geographical knowldege of Mesopotamia? Worry not, for GeaCron.com has a map for any era you could possibly want.
GeaCron lets you search in certain areas or specific cities throughout history and all over the globe. It also displays historical battles and areas that were contested. You can move through time by year, decade, or century and watch, or choose a specific year.