SPY Historian Vince Houghton sat down with intelligence historian Keith Melton, and former chief of the CIA’s Office of Technical Services, Bob Wallace, to discuss their newest collaboration: Spy Sites of Washington, DC.

Buy Spy Sites of Washington, DC from the Spy Museum Store (spymuseumstore.org/spy-sites-of-washington-dc-a-guide-to-the-capital-regions-secret-history/)