As i see, alot of sugestions were put in, even the smallest detailed ones, but maybe no one noticed but civ 2 was so far the most accurate of all civs (including 4) they ran the idea away from its original intent. It was supposed to be about creating civilizations from scratch with realistic obsticals and little characatures representing those tiny insignificant men, who together makes a nation. but now they have like units that are 6 times the size of the city and dam enemies that almost never use logic. My point is, when playing everything seems to close to each other, always. So i propose that we instead of making super graphics, make huge maps, 1/4-1/100 scale of earth itself! it won't eat as much memory as you think as long as the system is effecient unlike the current one. Just imagine the time it would take to finish one game! 
