The Greenbrier Bunker, also known as Project Greek Island, was a secret United States government continuity facility located beneath the Greenbrier resort in White Sulphur Springs, West Virginia. Built during the Cold War era, this underground bunker was designed to house and protect members of Congress in the event of a nuclear attack. The facility remained classified and operational from the early 1960s until 1992, when its existence was revealed by The Washington Post.
Today, the bunker has been decommissioned and is open to the public as part of the Greenbrier resort's historical tours, offering visitors a unique glimpse into Cold War-era military preparedness and government continuity planning.