Raven Rock Mountain Complex (Site R)

An 'underground Pentagon' cut into Raven Rock Mountain on the Pennsylvania–Maryland line, finished in 1953 as an emergency command centre.

1953 CE · 39.73, -77.42 · status: official

The account

It was used during the 2001 attacks and has fuelled persistent rumours of tunnels and secret uses.

Connections in the atlas

• Mount Weather

Sources

1. Wikipedia: Raven Rock Mountain Complex