Raven Rock Mountain Complex

Raven Rock Mountain Complex
Liberty Township, Adams County, Pennsylvania, United States
The Site R tunnel entrance with abutments (39.7296°N 77.4325°W / 39.7296; -77.4325, white figure in illustration) now has a building that is visible from a public road intersection to the west, particularly when trees are bare. The tunnel's other (east) opening is near the military installation's above-ground support area near the Route 16 intersection with Jacks Mountain Road.
Site information
Type	Nuclear bunker
Owner	U.S. government
Location
Raven Rock Mountain Complex Location within Pennsylvania Raven Rock Mountain Complex Location within the United States
Coordinates	39°44′03″N 77°25′11″W (mountain summit)
Site history
Built	1951–1953
See also: 1959 High Point bunker Mount Weather Emergency Operations Center 1959 Greenbrier nuclear bunker Project Greek Island

The Raven Rock Mountain Complex (RRMC), also known as Site R and simply The Rock, is a U.S. military installation with an underground nuclear bunker near Blue Ridge Summit, Pennsylvania. Raven Rock Mountain has been called an "underground Pentagon". The bunker has emergency operations centers for the United States Army, Navy, Air Force, and Marine Corps. Along with the Mount Weather Emergency Operations Center in Virginia and the Cheyenne Mountain Complex in Colorado, it formed the core bunker complexes for the US continuity of government plan during the Cold War to survive a nuclear attack.