I'm not too sure if its possible, but maybe improve the interior look of cities? I was really disappointed with RTW Vanilla with seiges because all cities are are just a block on a battle field. Cities that are supposed to be next to a river or the ocean are a few hundred meters away, instead of having a port!
Think how much more interesting it would be to be fighting in Babylon and be faced with a bridge in the middle of the city.
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