- The Council Citadel is a structure in the Beast Machines portion of the Generation One continuity family.
Standing above its surroundings in the capital city of Cybertron, the Council Citadel served as the meeting place for the Maximal Elders.
After "purifying" Cybertron, Megatron made it his base of operations, turning the meeting room into his throne room (although he was technically part of the ceiling). Master of the House
It was also where he originally kept the sparks of the kidnapped Transformers. Fires of the Past
During the Vehicons assault on the big floating head, it crashed into the Citadel after losing all its power, but without damaging the Citadel itself. Somethings are built to last. Endgame Part 1: The Downward Spiral