Keywords: washington dc united states unitedstates usa washington dc washingtondc nss nuclear security summit nuclearsecuritysummit 2016 hall architecture rotunda building auditorium indoor The main sessions of the Nuclear Security Summit were held in the Walter E. Washington Convention Center in Washington DC. (Ben Solomon/U.S. Department of State) More photos at www.flickr.com/photos/141427878@N08/ The main sessions of the Nuclear Security Summit were held in the Walter E. Washington Convention Center in Washington DC. (Ben Solomon/U.S. Department of State) More photos at www.flickr.com/photos/141427878@N08/ |