Unique improvement (Civ5)

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Unique improvements are a feature introduced to the series in Civilization V. These are improvements that can only be built by a certain civilization, although any civilization working its tile will still gain its effects. Unlike unique units or unique buildings, they will generally not replace another improvement.

Civilization	Unique improvement	Requires	Effects
Brazilian	Brazilwood camp	Machinery	+2 Gold +2  Culture after researching Acoustics
Dutch	Polder	Guilds	+3 Food +1 Production and +2 Gold after researching Economics
French	Chateau	Chivalry	+1 Gold +2 Culture +50% Defensive bonus for any unit on the tile Additional +2 Gold and +1 Culture after researching Flight
Incan	Terrace farm	Construction	+1 Food +1 additional Food for each adjacent Mountain
Moroccan	Kasbah	Chivalry	+1 Food, Production, and Gold 50% Defensive bonus for any unit on the tile
Polynesian	Moai	Construction	+1 Culture +1 Culture for each adjacent Moai +1 Gold after researching Flight
Portuguese	Feitoria	Navigation	1 copy of any Luxury resources owned by the City-State in whose territory the Feitoria is constructed +50% Defensive bonus for any unit on the tile Cannot be pillaged without declaring war on Portugal