Build and defend a Wonder to secure victory. Rival civilizations will be aware of its construction and seek to destroy it.
”
—Age of Empires IV description
The Wonder is a special building in Age of Empires IV that becomes available upon reaching the Imperial Age. In specific game modes, the Wonder grants victory if built and defended. Each civilization builds a Wonder of historical relevance and unique appearance, which included a different name and a different icon.
Originally, Wonders cost 3,000 of each resource. With patch 11963, Wonders cost 6,000 of each resource. With update 9.1.176, the cost is dependent on the size of the map: Micro - 5,000; Small - 6,000; Medium - 7,000; Large and Larger - 8,000.
Originally, Mongol Wonders cost 4,000 food/wood/gold. With patch 11963, they cost 8,000 food/wood/gold. With update 9.1.176, they cost 6,650/7,980/9,310/10,640 food/wood/gold depending on the map size.
Originally, Mongol Wonders cost +33.33...% (exactly one-third) food, wood, and gold (in exchange for no stone). With update 9.1.176, they cost +33% (slightly less than one-third). This small discount was introduced since most of the new costs are not divisible by 3.
Trivia[]
Age of Empires IV is the first game in the series where the Chinese Wonder is not the Temple of Heaven.
The Mongol Wonder is considered to be anachronistic within the Age of Empires IV time-frame, as its real-life counterpart was built around 2008.
This may be justifiable on historical grounds, as many of the monuments and palaces that were built in the Mongol Empire's capital, Karakorum, have long been destroyed or abandoned. This is similar to the Mongol Wonder in Age of Empires II, where their wonder is based on an artistic depiction rather than a real-life monument.
The Holy Roman Empire's Wonder is modelled in appearance on the Kronborg in Denmark, while its name references the town of Flensburg in Schleswig (then a Danish vassal duchy), despite neither having belonged to the Holy Roman Empire historically.
Emperor's Guard (Passive, 
Abbasid Dynasty
Byzantines
Chinese
Delhi Sultanate
English
French
Holy Roman Empire
Japanese
Malians
Mongols
Ottomans
Rus
Court Architects (+30%)
Slate and Stone Construction (+5 fire armor, 
Order of the Dragon)
Gion Festival (+2 tiles, 
Yorishiro Bonus (+4000, 
Emergency Repairs (150 hp/s for 20 seconds, 
House of Wisdom Influence (+5 fire armor, 
Ayyubids)
Praesidium Influence (-5% per Cistern water level, 
Zhu Xi's Legacy (+100%)
