I wish Civ producers would do what any sane city-builder does when faced with a river. Before the tech Bridge Building, build on only ONE side of the river. Then, after Bridge Building, have the city on BOTH sides, with bridges in between... am I insane for thinking that would be AWESOME!?! Stone bridges for Ancient Era, Brick/mortar for Middle, Steel for Industrial, and cement for modern! Yes, I know there aren't any "eras" for techs, but the cities will still change design, right? If I see stone cities in the Modern era, I'll have to do this:

