I've played a few in my time, and am currently playing 2 including a Star Wars one set in the year 20 ABY (just after the peace with the Empire).
Now while wandering the internets I stumbled across one which was amaizing looking and incrediblely complex. It was set several hundred years BC, and small nations were in 3 separate areas: Central and Southern America, the Mediterranian, and East Asia. It had a great map and rules for the game to expand into the future, even encompassing the entire world and moving forward in history.
My problem is I accidentally closed the window, and cannot refind this game. If anyone has any way to help (and if you say use Google I'll kill ya

Or if you're interested in these games, post here or message me and I can send you some links to a few games.