Project Greek Island was a secret United States government continuity program located at the Greenbrier hotel in West Virginia. The facility, originally code-named "Project Casper," was designed to serve as an emergency relocation center for the United States Congress in the event of a nuclear attack during the Cold War. The bunker was constructed in the late 1950s and remained operational until 1992, when it was publicly exposed by The Washington Post.
Following its decommissioning, the facility has been repurposed and is now known as the Greenbrier Bunker, offering tours to the public and serving as a historical site that highlights Cold War-era military preparedness and civil defense strategies.