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 1958-1961 during the Cold War era, 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 working undercover as television repairmen at the resort.
The facility featured a 25-ton blast door, decontamination chambers, a power plant, medical clinic, and dormitories capable of accommodating over 1,100 people. Its existence was kept secret from the American public and even most resort employees until 1992, when The Washington Post exposed the program. Following its declassification, the bunker was decommissioned and later opened for public tours as part of the resort's historical attractions.