During World War I, at least a portion of it had the outward appearance of a metal shack. It was surrounded by barbed wire. The building was used for experiments for Project: Twilight. At least 57 test subjects were taken to the facility and injected with the Twilight Virus. On 4 October 1915, these test subjects escaped from the facility, killing 20 of the facility staff. (AUDIO: Project: Twilight)
By 2001, the facility had 25 levels. The first 12 floors contained vehicle bays, laboratories, barracks, a gym, a firing range, and several storage areas. The thirteenth floor contained Charles Crichton's office and the mess hall. Floors 14 to 25 mostly contained research labs which were off-limits to low-ranking Forge personnel.
A network of lifts and ladders connected the facility with the outside world. The main lift exited into the crumbling remains of the asylum. A helicopter landing pad was located nearby. (PROSE: Project: Valhalla)