Improvement

An Improvement can be built on a tile in the territory of a City and grants Yields. Most Improvements are built by Workers, while Religious Improvements must be built by an Religion#Acolyte of the corresponding Religion. Each Improvement costs some quantity of Goods and takes some number of turns to build. Once completed, Improvements generate Yields every turn and allow the city they are in to train a Specialist that can boost their Yields. Improvements can be divided into Rural and Urban Improvements. Rural Improvements, such as Farms or Mines, represent the resource-generating backbone of a nation and can be placed on most terrain, while Urban Improvements represent expansions of the nation's cities and are subject to additional placement restrictions. Each Improvement increases a City's Maintenance by 2.

Rural Improvements

For each type of Good, there is a Rural Improvement intended to be the primary source of that Yield, in addition to some Improvements which exploit particular Resources. Each Rural Improvement can be built anywhere, any number of times, and most get bonuses for adjacent identical improvements.

Improvements built on Resources have their Yields increased or changed—note that, in the table below, some resource bonuses are added (like a Farm on Sorghum getting +2 , +5 ), and some replace the original yield (like a Gold Mine giving +40 but no ). Some Improvements, such as Pastures, have no base Yields and only get Yields from the Resource they are built on. Also note that some adjacency bonuses boost one of an Improvement's Yields in particular, while others boost the entire output—a farm on Sorghum on Lush terrain will only have its Food output boosted by the Lush terrain, but will have its Growth and Food increase for each adjacent Farm.

Improvement	Enabled By	Build Cost	Build Time	Yields	Terrain Bonuses	Adjacency Bonuses	Other Bonuses	Specialist Enabled
Farm	Lush Temperate Arid Wheat Barley Sorghum With Centralization: Marsh	20	3 Turns	5	Marsh: 2 Lush: +40% Arid: -40%	Farm: +10% Volcano: +40% Fresh Water: +20% Pasture: +40% Granary: +60% Sun Shrine: +20% River, as Egypt: +40%	Sorghum, Wheat, or Barley: +2 , +5 Landowners City: +5	Farmer
Mine	Lush Temperate Arid Hill Ore Salt Gems Gold Silver	20	3 Turns	5	Hill: +60%	Mine: +10% Windmill or Watermill: +100%	Ore: 2 , 5 Salt or Gems: 2 , 20 Gold or Silver: 40 City with Redemption Cathedral: +20% Autarky: +20%	Miner
Quarry	With Stonecutting: Lush Temperate Arid Adjacent Volcano Adjacent Mountain Marble	20	3 Turns	5	Arid: +20%	Quarry: +10% Mountain: +40% Volcano: +40% Windmill or Watermill: +100%	Marble: +2 , +5 City with Redemption Cathedral: +20% Autarky: +20%	Stonecutter
Lumbermill	With Forestry: Trees	20	3 Turns	5		Lumbermill: +10% Camp: +20% River: +60% Windmill or Watermill: +100%	City with Redemption Cathedral: +20% Autarky: +20%	Woodcutter
Pasture	With Husbandry: Horses Cattle Sheep Pigs Goats	20	3 Turns				Horses: 0.5 Cattle, Sheep, Pigs, or Goats: 2 , 10 Persia: +0.5	Rancher

Urban Improvements

Urban Improvements, except those with the "Build Anywhere" attribute, are subject to Urban placement restrictions, meaning that they can only built adjacent to two or more Urban tiles, on the coast adjacent to one or more Urban tiles, or on preexisting Urban terrain. In addition, most Urban Improvements have Culture Level restrictions, and either cannot be built if the Culture Level of the city is too low, or can only be built once per Culture Level. Those that require a particular Culture Level are all part of a particular class of Improvements, can only be built once per City, and also require the previous Improvements of that class to be built. For example, the Odeon, Theater, and Amphitheater are all part of the Odeon class. To build a Theater, a City must have a Culture Level of Developing and an Odeon. There are also benefits to Urban Improvements: they automatically add a Road to the tile they are built on, and they expand the Borders of the city they are built in to encompass all tiles surrounding the Improvement.

Shrines

All Shrines cost 40 and take 4 turns to build. They can be built on Urban, Lush, Temperate or Arid tiles, and only one of each may be be built per nation unless Polytheism is enacted.

Building a Shrine in a city will add your nation's Pagan Religion to that city which gives +2 . Each shrine increases the opinion of your Pagan Religion by 2.

There are ten different shrines (plus an eleventh, exclusive to Ptolemy). Each nation can build a different set of four shrines, and each nation has its own name for each shrine, based on that nation's traditional deities.

Internal Name	Effect	Nation (Name)
Sun Shrine	+0.5 +20% yields for adjacent farms	Assyria (Shamash) Egypt (Ra) Persia (Hvar Khshaita) Kush (Melul)
War Shrine	+2 +10 XP/Turn for idle Infantry on Shrine	Assyria (Ninutra) Hatti (Tarhun) Rome (Bellona) Kush (Apedemek)
Kingship Shrine	+2 +1 per adjacent Wonder	Assyria (Ashur) Babylonia (Marduk) Greece (Zeus) Kush (Amani)
Wisdom Shrine	+2 +1 per adjacent Odeon class improvement (Babylon) or Courthouse class improvement (Greece)	Babylon (Nabu) Greece (Athena)
Hunting Shrine	New Ranged Units: +1 Level +20% yields for adjacent Camps	Egypt (Neith) Hatti (Halki) Persia (Mithra)
Fire Shrine	+1 per adjacent Lumbermill +20% yields for adjacent Mines	Assyria (Nuska) Persia (Atar) Rome (Sol)
Hearth Shrine	+2 +10 per adjacent Resource	Carthage (Tanit) Hatti (Arrinitti) Rome (Ceres)
Love Shrine	+2 +20% yields for adjacent Pastures	Babylonia (Ishtar) Carthage (Hammon) Rome (Feronia) Kush (Sabomakal)
Underworld Shrine	+2 +100% per adjacent Volcano +50% per adjacent Mountain	Babylonia (Ereshkigal) Egypt (Osiris) Greece (Hades)
Water Shrine	+20 +2 per Water tile in city borders +20% yields for adjacent Nets	Carthage (Melqart) Greece (Poseidon) Persia (Anahita)
Healing Shrine	New Units start with Healer +2 per adjacent Grove	Carthage (Eshmun) Egypt (Isis) Hatti (Kamrusepa)
Happiness Shrine	+1 +1 per adjacent Odeon class improvement	Greece (Serapis), with Ptolemy

Religious Buildings

All religious buildings require either Urban, Lush, Temperate or Arid Terrain, and the city must follow the appropriate religion.

	Build Cost				Yields
Building	Turns							Notes
Monastery	4	60	0	0	2	0	-2	+2 religion opinion
Temple	5	0	60	0	0	3	-2	+0.5 , +2 religion opinion
Cathedral	6	0	100	0	0	0	-4A	+50% , +5 legitimacy, +4 religion opinion
Holy Site	8	0	200	200	0	0	-2	+10 Religion Opinion, +20% , 2 Victory points, creates disciple every 20 turns