|Menwith Hill is the worlds largest monitoring communications station and is situated just outside Harrogate, North Yorkshire, UK. Its official title is R.A.F Menwith Hill which is misleading since it is actually run by the US National Security Agency (NSA), and known as Spy Station F83 .|
The official cover story is that it is an all-civilian base and is a Department of Defence communications station, the Ministry of Defence (MoD) describing it as a "communications relay centre".
The real story is that it intercepts and monitors over 4 billion emails and telephone conversations each day.
The base is dotted with several dozen white radio domes , each containing a satellite dish.