Civilization IV: City Improvements

There are two significant changes from the city improvements in Civ3. The first difference is city improvements no longer have upkeep cost in Civ4 -- the city maintenance cost now depends on the number of cities your have, distance from your capital, and your civic choices. The second difference is the new health system. Now some buildings, such as aqueducts and supermarket, can improve the health of your city, while some other improvements, such as forge and factory, can reduce your city's health.

The table below has 54 city improvements. 21 of them are religious improvements: each of the seven religions in the game has a temple, a monastery, and a cathedral level building.

Icon	City Improvement	Cost	Requires	Effects
	Academy	-	Great Scientist	+4 culture +50% science
	Airport	250	Flight	+1 Can airlift 1 land unit per turn +1 trade route
	Aqueduct	100	Mathematics Masonry	+2 health Required to build the Hanging Gardens Available for free on Industrial and later starts
	Bank	200	Banking	+50% commerce Required to build Wall Street Available for free on Modern and later stats
	Barracks	60	-	New land units receive +4 experience points Required to build Heroic Epic
	Bomb Shelters	100	Electricity	-75% damages from nukes Requires the Manhattan Project
	Broadcast Tower	175	Mass Media	+50% culture +1 per 10% rate Can turn 2 citizens into artists +1 from hit musicals, hit singles, hit movies
	Buddhist Monastery	60	Meditation Buddhism	+2 culture +10% research Required to train Buddhist Missionary Obsolete with Scientific Method
	Buddhist Stupa (Double Production Speed w/ Copper)	300	Music Buddhism 3 Budd. Temples	+50% culture +2 if Buddhism is state religion Can turn two citizens into priest +1 from Incense
	Buddhist Temple	80	Priesthood Buddhism	+1 culture +1 Can turn 1 citizen into Priest
	Bunker	100	Electricity	-75% damage from air units
	Castle (Double Production Speed w/ Stone)	100	Engineering Walls	+1 culture 50% defense (except vs. Gunpowder-based units)
	Christian Cathedral (Double Production Speed w/ Stone)	300	Music Christianity 3 Christ. Temples	+50% culture +2 if Christianity is state religion Can turn two citizens into priest +1 from Incense
	Christian Monastery	60	Meditation Christianity	+2 culture +10% research Required to train Christian Missionary Obsolete with Scientific Method
	Christian Temple	80	Priesthood Christianity	+1 culture +1 Can turn 1 citizen into Priest
	Coal Plant	150	Assembly Line Factory	Provides power with Coal (+2 )
	Colosseum	120	Construction	+1 +1 per 20% culture rate
	Confucian Academy (Double Production Speed w/ Copper)	300	Music Confucianism 3 Confu. Temples	+50% culture +2 if Confucianism is state religion Can turn two citizens into priest +1 from Incense
	Confucian Monastery	60	Meditation Confucianism	+2 culture +10% research Required to train Confucian Missionary Obsolete with Scientific Method
	Confucian Temple	80	Priesthood Confucianism	+1 culture +1 Can turn 1 citizen into Priest
	Courthouse	120	Code of Laws	-50% maintenance Required to build Forbidden Palace
	Drydock	120	Steel	+1 New water units receive +4 experience points Builds water units +50% faster
	Factory	250	Assembly Line	+1 +25% hammers +50% hammers with Power Can turn 2 citizens into Engineer Required to build coal plant, hydro plant, nuclear plant
	Forge	120	Metal casting	+1 +25% hammers Can turn 1 citizen into Engineer +1 from Gems, Gold, Silver Required to build Ironworks, The Colossus, The Eiffel Tower, the Statue of Liberty Available for free on Modern and later starts
	Granary	60	Pottery	Stores 50% of food after growth +1 health from Corn, Rice, Wheat Available for free on Renaissance and later starts
	Grocer	150	Guilds Currency	+25% commerce Can turn 2 citizens into Merchant +1 health from Banana, Spices, Sugar, Wine Required to build Supermarket Available for free on Industrial and later starts
	Harbor	80	Compass	+50% trade route yield +1 health from clam, crab, fish Available for free on Modern and later starts
	Hindu Mandir (Double Production Speed w/ Marble)	300	Music Hinduism 3 Hindu Temples	+50% culture +2 if Hinduism is state religion Can turn two citizens into priest +1 from Incense
	Hindu Monastery	60	Meditation Hinduism	+2 culture +10% research Required to train Hindu Missionary Obsolete with Scientific Method
	Hindu Temple	80	Priesthood Hinduism	+1 culture +1 Can turn 1 citizen into Priest
	Hospital	200	Medicine	+3 health Heal units extra 10% damage/turn Required to build Red Cross
	Hydro Plant	200	Plastic Factory	Provides power
	Islamic Monastery	60	Meditation Islam	+2 culture +10% research Required to train Islamic Missionary Obsolete with Scientific Method
	Islamic Mosque (Double Production Speed w/ Marble)	300	Music Islam 3 Islamic Temples	+50% culture +2 if Islam is state religion Can turn two citizens into priest +1 from Incense
	Islamic Temple	80	Priesthood Islam	+1 culture +1 Can turn 1 citizen into Priest
	Jail	120	Constitution	-25 War Available for free on Modern and later starts
	Jewish Monastery	60	Meditation Judaism	+2 culture +10% research Required to train Jewish Missionary Obsolete with Scientific Method
	Jewish Synagogue (Double Production Speed w/ Stone)	300	Music Judaism 3 Jewish Temples	+50% culture +2 if Judaism is state religion Can turn two citizens into priest +1 from Incense
	Jewish Temple	80	Priesthood Judaism	+1 culture +1 Can turn 1 citizen into Priest
	Laboratory	250	Computers Observatory	+1 +25% science +50% spaceship production Can turn 1 citizen into scientist
	Library	90	Writing	+2 culture +25% science Can turn 2 citizens into scientist Required to build University, National Epic, The Great Library
	Lighthouse	60	Sailing	+1 food on water tiles Required to build The Great Lighthouse Available for free on Industrial and later starts
	Market	150	Currency	+25% commerce Can turn 2 citizens into merchant +1 from fur, ivory, silk, whale Available for free on Industrial and later starts
	Nuclear Plant	250	Fission Factory	Small chance of nuclear meltdown Provides power with Uranium
	Obelisk	30	Mysticism	+1 culture Obsolete with Calendar
	Observatory	150	Astronomy	+25% science Can turn 1 citizen into scientist Required to build Laboratory
	Recycling Center	300	Ecology	No from buildings
	Supermarket	150	Refrigeration Grocer	+1 health from cow, deer, pig, sheep
	Taoist Monastery	60	Meditation Taoism	+2 culture +10% research Required to train Taoist Missionary Obsolete with Scientific Method
	Taoist Pagoda (Double Production Speed w/ Copper)	300	Music Taoism 3 Taoist Temples	+50% culture +2 if Taoism is state religion Can turn two citizens into priest +1 from Incense
	Taoist Temple	80	Priesthood Taoism	+1 culture +1 Can turn 1 citizen into Priest
	Theatre	50	Drama	+3 culture +1 per 10% culture rate Can turn 2 citizens into artists +1 from dye Required to build Globe Theatre
	University	200	Education Library	+3 culture +25% science Required to build Oxford University
	Walls (Double Production Speed w/ Stone)	50	Masonry	50% defense (except vs. gunpowder-based units) Required to build Castle

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Civilization IV: City Improvements

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