Although during the game it is largely considered a memorial erected in Esthar at the end of the Sorceress War, the Sorceress Memorial was in truth the reason the war ended. Dr. Odine created the Memorial as a facility to seal magic, then known as the "Sealing Facility". The facility became part of the plan to seal away the evil Sorceress Adel; a kind of armored cryo-capsule was placed it inside the Memorial, and a simulacrum image of the girl Ellone, whom Adel was searching for, was created. Once Adel was informed Ellone was being held inside this newly constructed building, the sorceress went there at once, possibly smelling a trap but trusting in her sorceress powers to keep her safe.
Once at the Memorial, Adel saw the hologram of Ellone and immediately realized it was a fake, however, Laguna quickly pushed her into the seal and and she was flash frozen. Because it was still too dangerous to keep her there even in her frozen state, the capsule was ejected from the Sorceress Memorial into space using three Ragnarok airships that launched from the Memorial.
During the game's events Esthar wants to seal Rinoa in the Sorceress Memorial after she is viewed as a threat to mankind. Rinoa, scared of her newly awakened sorceress powers, allows herself to be sealed, but Squall rescues her before she is frozen.
The Sorceress Memorial is located on a peninsula closest to Esthar City but still within the borders of the Great Plains of Esthar.