British Secret Intelligence Service (AKA MI6), London
The building went from a secret location to one that could not be more conspicuous, after digital security became more important than literal invisibility. The entire building sits inside a Faraday Cage.
Czech Security Information Service HQ, Prague
The Lubyanka, Soviet Secret Police Headquarters
Hungarian Secret Police HQ
U.S. Secret Service Building, D.C.
Iraqi Secret Police HQ
East German Stasi HQ
National Security Agency Headquarters, Fort Meade
South Korean National Intelligence Service (NIS) Building
The building has now been converted into a Youth Hostel.
Converted Former Romanian Securitate
Bizarrely, the former secret service HQ has been converted into the Romanian Architects Association.
Franco's Secret Police HQ, Spain
The building was known as the House of Screams.
Secret Service Building, Cuba
Australian Secret Intelligence Service H.Q., Barton Australia
The R.G. Casey building houses the Australian Department of Foreign Affairs and Trad contains the intelligence service.