Protip: This is a really bad question to ask when visiting the National Mall. We have 8 buildings surrounding the Mall, and a total of 19 museums, 9 research centers and the National Zoo. A S.H.I.E.L.D agent should know better!
A photographer by the name of Ann Gordon signed up for my letter-writing workshop at Have Company last minute when we announced two openings the night before. She drove two and a half hours to attend and just e-mailed me a collection of beautifully taken photographs from the event. What an absolute blessing.