Buildings in "Age of Mythology" can generally be split into three categories: economic, military, and defensive. The most important economic building is the Town Center, which is similar to the building of the same name in the "Age of Empires" series games. Most civilian units are trained at the Town Center, as are some improvements. Most importantly, players advance Age via the building. The Town Center provides 15 population slots, and building additional houses will earn the player 10 additional slots per house. In the Heroic Age, players may claim settlements (unclaimed Town Centres) for additional population slots. In some cases owning all town centres will trigger a countdown to victory. Other economic buildings include the farm and market.