National Wonder. Can only be built once in your empire. Must be built on flat terrain.

Allows Cities having Airport districts or International Airport wonder to import Food Products, Drinking Products and Commodity Products from countries around the world.+3 Trade Route capacity. Plantations and Lumber Mills in Cities with Airport districts and/or the International Airport wonder provide +50% Tourism. International Trade Routes to or from this City provide you with Specialty Districts yields as if this City is the destination; this bonus is doubled if the City has an Airport district and/or the International Airport wonder. Provides an additional level of Diplomatic Visibility to all Civilizations.

+2 Tourism
+1 extra per Era that you've advanced past this Wonder's era