The Greenbrier Bunker, officially known as Project Greek Island, was a secret United States government continuity facility located beneath the Greenbrier resort in West Virginia. Constructed during the Cold War era in the late 1950s, this underground bunker was designed to house the United States Congress in the event of a nuclear attack. The facility remained operational for over thirty years until its existence was revealed by The Washington Post in 1992, after which it was decommissioned.
Today, the bunker serves as a historical attraction offering guided tours that showcase its role in Cold War military history and civil defense preparations.