The Ballista Camp is an Iron Age Military Building. It is where a player can train Ballistas, an artillery unit of the age. It is the last unlocked military building of the age. In order to construct a Ballista Camp, a player needs to have unlocked the Mathematics tech.
It is recommended to build the Ballista Camp. It can replace the underpowered Stone Thrower of the previous age and is useful against Archers and Legionnaires.
In update 1.85, the graphic of the Ballista Camp was reworked.