I really, really like the culture aspect added to Civ 3 but there are a few tweaks that I think would be more reasonable. Also, my suggestion invloves some of the "useless" techs, IOW techs that just don't do anything of themselves. There are far too many, especially in the Middle Ages.
Cathedrals should only give 2 cpt but discovery of
Music Theory increases them to 3 cpt.
Minor I know, but more realistic to the game, I think
Colusseums should be a militaristic building and should cost them half price, they should start as 2 cpt, like they do now, but get +1 for discovery of
Free Artistry and +1 for the discovery of
Electronics (TVs and Football!)
Libraries should start out at 2cpt and get +1 with
Printing Press
An even bigger tweak would be to have the culture more tied to the traits for each Civilization. As it is now only the Scientific and Religous are cultural, that is too restrictive. (I'm going to dispense with the IMO because I'm posting this, who else's opinion might it be?) Also, we know that a building doubles in cpt after 1000 years. I like that rule and want to expand on it. I think my best example would be with Zulu. They are militaristic and expansionist. Under my "modification" for Zulu all religous and scientific buildings would be -1 cpt than they already are but any military or expansionist improvement should be +1 after 1000yrs. Imagine a structure that's a 1000 yrs old in your community. Not too many probably, right? So if there is even just a granery that is that old that is going to have cultural significance, it has to. There would be stories and legends about how it was built, why, and other cultural things. This would apply to all the other traits, too. Commercial civs would get culture from very old markets and banks, I doubt there would be any ancient stock exchanges, but maybe. Seafaring would get culture from harbors, Agricultural would overlap expansionist somewhat. My system breaks down a bit for industrious because I can't really say what an industrious improvement is before factories and they would be too late, but I also think the very old courthouses should get +1 culture for everyone. A courthouse, no matter what kind of goverment, is a center of that civilization's cultural identity. So industrious would be lower on the culture that the other traits but it's like that now anyway, I don't think we should artifically designate an improvement industrious so everybody gets one. This would certainly make the Babylonians less the cultural
powerhouse, so to speak, and allow other civs more balance in this regard. You'd still be able to ignore culture and kill everyone with troops, so I don't think it would hurt game play.