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Choose a year to get a world map for that year of history, you can scroll by year.At the bottom of the map, you can select a number of years, click the play and just watch the world map change. You can turn on the playlist in ascending or descending order.
There is a search for cities or events. There is a time scale (Go To TimeLine) with significant events in the history.
You can take a link (from the LINK form field) and share a map of a certain year.