The Citadel is a gigantic Combine megastructure located in the heart of City 17, which serves as the main base of operations and primary headquarters of the Overwatch, from which they govern the Earth. Easily the most striking symbol of the Combine's rule, the Citadel looms ominously above the city as a constant reminder of their presence, and serves as the personal residence of Earth's appointed Administrator, Dr. Wallace Breen. The Citadel is located at the epicenter of City 17, and...
