Improvement	Requires	Building Cost	Maintainance Cost	Function
Aqueduct	Construction	120		Allows city to grow over 10
Bank	Banking	120		Tax and luxuries increase by 50%
Barracks	Nothing	40		Allows city to build veteran units
Cathedral	Religion	160		4 unhappy people are content.
City Walls	Masonry	120		3X Defense bonus and no population loss if attacked.
Colosseum	Construction	100		3 unhappy people are content
Courthouse	Code of Laws	80		Reduces corruption by 50%
Factory	Industrialization	200		Production is increased by 50%
Granary	Pottery	60		Only 50% of food is used to grow population
Hydro Plant	Electronics	240		Production is increased by 50%. Existing pollution is reduced
Library	Writing	80		Lightbulb production is increased by 50%
Marketplace	Currency	80		Luxuries and Taxes are increased by 50%
Mass Transit	Mass Production	160		All pollution caused by city population is prevented
Mfg. Plant	Robotics	320		Production is increased by 100%.
Nuclear Plant	Nuclear Power	160		Factory production is increased by 50%. Low pollution. RISK OF MELTDOWN before fusion power is discovered, especially if there is civil disorder.
Palace	Masonry	200		Your capital. The farther cities are from it, the more corruption they will have.
Power Plant	Refining	160		Factory production is increased by 50%. High pollution levels.
Recycling Center	Recycling	200		Industrial pollution is reduced by 67%.
SDI Defense	Superconductor	200		Protects city from nuclear attacks
Temple	Ceremonial Burial	40		1 unhappy person is made content (2 with Mysticism)
University	University	160		Lightbulb production is increased by 50%