The Greenbrier Bunker, officially known as Project Greek Island, was a secret United States government continuity facility located beneath the Greenbrier resort in White Sulphur Springs, West Virginia. Constructed in the early 1960s during the Cold War, this underground facility was designed to house and protect the United States Congress in the event of a nuclear attack. The bunker remained operational for over thirty years, maintained by government employees who worked undercover as hotel staff.
The facility was decommissioned in 1992 after its existence was revealed by The Washington Post, ending one of the most closely guarded secrets in American Cold War history.