I tend to neglect my culture generation in the mid-game when I'm not going for culture victory, which can sometimes come back to bite me in the late game with tourism influence. Just wondering what some good "cost efficient" culture generation strategies are. Should I be allying cultural city-states rather than the mercantile ones I tend to focus on for happiness? Are culture buildings (amphitheater, opera house, etc.) even worth it? More generally, how do culture specialists fit into a science/diplo game?