Common Improvements
Great Wall
Description
Unlocks the Builder ability to construct the Great Wall, unique to China.

+1 [ICON_FOOD] Food, +2 [ICON_GOLD] Gold. Provides an increase to [ICON_STRENGTH] Defense. Enemy military units recieve -2 [ICON_STRENGTH] Strength from each adjacent Great Wall. +2 [ICON_CULTURE] Culture from each adjacent Great Wall. +2 [ICON_GOLD] Gold from each adjacent Great Wall after researching 'Castles' Technology. Built on tiles adjacent to the builder. Must be built in a line along the borders of your empire. Can be built on Mountain or Forest or Swamp tiles. Can only be pillaged (never destroyed) by natural disasters.

Once Buttress is unlocked it can also be built on Floodplains.
Adacency Bonus
+2 [ICON_CULTURE] Culture from each adjacent Great Wall tile, requires Masonry.
+2 [ICON_GOLD] Gold from each adjacent Great Wall tile, requires Castles.
ICON_IMPROVEMENT_GREAT_WALL
Traits
Unique To
+1 [ICON_FOOD] Food
+2 [ICON_GOLD] Gold
plunder yields: 50 [ICON_GOLD] Gold
Requirements
Technology
Built By
Language