National Reconnaissance Office (NRO) Headquarters, Virginia

The headquarters for the National Reconnaissance Office, the federal spy satellite organization, is located in this four-building complex on 68 acres, five miles south of Dulles International Airport. The $350 million complex was completed in 1994, and houses around 3,000 NRO employees. The NRO was established in 1961, but its existance was classified until 1992. The location of the headquarters was declassified in 1994, after construction had nearly been completed, under the false name of a private company.