The Monument is an unconstructable building in Age of Empires II: The Conquerors. Monuments have the same appearance as Wonders, but they cannot be attacked or destroyed. Instead, a Monument changes color when a unit approaches it and no other units surround it. So in order to capture a Monument, all enemy units surrounding it must be killed or chased away. A Monument is the key object in any King of the Hill match, as the player who is first able to conquer the Monument in the center of the map and successfully defends for 550 years wins the game.