Sith Academy, Korriban

Established at the back wall of the Valley of the Dark Lords, the exact date of the Academy's founding is lost to history, tracing its roots back to at least the time leading up to the Great Sith War. The temple's upper structures were ruined, but this did not prevent the academy from being fully operational as of 3993 BBY. Despite the Academy's existence, the Jedi Order did not lead an assault on the facility after the conclusion of the war.