Together with your Allies, you can build one of the 7 Wonders of the World.
When built, Wonders create an Alliance territory even greater than the one made by the Fortress, and give extra buff effects to all members of an Alliance, even to the ones whose Castles are located outside of the Alliance territory.
One Alliance can only possess one Wonder, and to be able to build another one, the existing must be demolished.
In order to become eligible and initiate a Wonder building, the following conditions must be met:
1. Alliance must have more than 5 members
2. The total Castle level of the Alliance members added up must be over 50
There is a selection of the following Wonders and effects in Civilization War:
| Image | Name | Effects |
 | The Colossus of Rhodes | Increase Siege Engine troop ATK +15% Increase DEF in Siege War offense +10% Increase all troops DEF +10% Increase all troops HP +10% |
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The Statue of Zeus at Olympic | Increase troops ATK when attacking Imperial City +15% Increase troops HP when attacking Imperial City +10% Increase all troops DEF +10% Increase all troops HP +10% |
 | The Temple of Artemis | Increase Cavalry ATK +15% Increase DEF in Siege War offense +10% Increase all troops DEF +10% Increase all troops HP +10% |
 | Pyramid | Increase troops ATK when attacking Wonder +15% Increase troops HP when attacking Wonder +10% Increase all troops DEF +10% Increase all troops HP +10% |
 | The Hanging Gardens of Babylon | Increase Resource Gathering speed for all resources +35% Increase March speed +20% Increase all troops DEF +10% Increase all troops HP +10% |
 | The Lighthouse of Alexandria | Increase DEF in Siege War defense +10% Increase Hospital capacity +15% Increase all troops DEF +10% Increase all troops HP +10% |
 | Mausoleum of Maussollos | Increase Training speed +10% Decrease Troop Training cost of all resources -5% Increase all troops DEF +10% Increase all troops HP +10% |
Wonders can be attacked by the enemies, so make sure to assign the Wonder Protector and station troops there to defend your Wonder from being destroyed by rivals.
Only 3 different Alliances may initiate construction of the same Wonder at the same time, however, only an Alliance that completed the Wonder first, will be able to keep it. In such case all other similar Wonders still being constructed at the same continent will be automatically demolished.
In other words, only one Wonder of each kind can exist on the same continent.