Priest and Arkin's Top Secret America: The Rise of the New American Security State
an effort to catalog "physical traces" of the surveillance network; "to find out just how close someone without a top secret clearance could get to the research facilities and office buildings where people spent their working days spying on their countrymen" (Beck's summary, 401)
they visit DPAO (Defense Policy Analysis Office) facilities in a shopping mall, among other sites