Sugar Grove Naval Communications Center, West Virginia

Sugar Grove is a military communications center, with a two-story underground facility, operated primarily by the Navy, at least until 2015, when operational functions will be transferred to the National Security Agency. As part of its eavesdropping function within the larger ECHELON global surveillance network, the center intercepts all international communications entering the eastern United States. It is located within the National Radio Quiet Zone, a 13,000 square mile zone established by the FCC in 1958 so that this facility (and the National Radio Astronomy Observatory in Green Bank, West Virginia) could operate in an area with little radio disturbance.