Opera House Provides Spectacular Setting For Conference -- San Francisco's beautiful Opera House. A memorial to its war dead, presented this view from the orchestra pit during today's session of the World Security conference. Delegates from 46 nations around the world occupy on the floor. Press and radio cover the event from boxes in the diamond horseshoe, Spectators sit in the two balconies. May 1, 1945. (Photo by AP Wirephoto).