Originally posted by God
Pyramids never expire. But they are hard to get on higher difficulties. Easier to get your neighbor to build it and take it from them.
I tried a huge map, pangaea, Americans, and with a dense build (cities every 2-3 squares, alot of overlapping), and I haven't built a improvement yet. Don't need libaries since I get the techs from the AI through whatver means. Don't need temples as yet because my cities are small and I have a luxury hooked up and lux tax at 30%.
Only improvements I would need to build for this game is marketsplaces and aqueducts.
BTW its on monarch.