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Terrains can be modified by human-made (worker units) features called improvements. These improvements are summarized in the following table:

Improvement Requirements Bonus yield Economic bonus Military bonus Upgrades to
Fortified cave Shelter Building
  • +15% tile defense.
  • Acts as a city for combat purpose.
  • +1 Visibility height.
  • +50% Air defense.
Fortified cave with cache
Fortified cave with cache Pottery
  • +25% tile defense.
  • Acts as a city for combat purpose.
  • +1 Visibility height.
  • +90% Air defense.
  • Influences tiles in range 1.
Fort
Fort Mathematics
  • Provides any tradeable resource in the tile.
  • +50% tile defense.
  • Acts as a city for combat purpose.
  • +1 Visibility height.
  • +2 Visibility range.
  • +20% Air defense.
  • Influences tiles in range 1.
  • Provides ZoC.
Command bunker
Command bunker Electricity
  • Provides any tradeable resource in the tile.
  • +75% tile defense.
  • Acts as a city for combat purpose.
  • +1 Visibility height.
  • +2 Visibility range.
  • +40% Air defense.
  • Influences tiles in range 1.
  • Provides ZoC.
Command center
Command center Metamaterials Provides any tradeable resource in the tile.
  • +100% tile defense.
  • Acts as a city for combat purpose.
  • +1 Visibility height.
  • +2 Visibility range.
  • +60% Air defense.
  • Influences tiles in range 1.
  • Provides ZoC.