Raven Rock Mountain Complex

The Raven Rock Mountain Complex is a military facility carved inside a mountain in Liberty Township, Pennsylvania, close to the Maryland border. The underground structure includes several buildings, rooms for technical equipment, supply facilities, and offices connected by a network of tunnels and corridors.

The construction of this facility began around 1950 as a protected command post in case of nuclear conflict, with land acquired by federal authorities. The facility was expanded and modernized several times during the Cold War to serve as an emergency center for military leadership.

The facility earned the informal name 'Harry's Hole' among local residents, referring to President Truman's involvement in establishing this underground military base.

The facility is not open to the public and remains in active use for military purposes, with strict security measures around the site. Visitors without clearance are not allowed to approach the entrance area or take photographs of the secured access points.

On September 11, 2001, this site served as a refuge for senior government officials to ensure continuity of state leadership. Among local residents, the facility was known by an informal name that alluded to President Truman and his role in its establishment.

Location: Pennsylvania

Inception: 1951

Address: Outer Roadway

GPS coordinates: 39.73400,-77.41900

Latest update: December 14, 2025 22:42