Flag Wall and Great Seal in the National Museum of American Diplomacy in Washington DC | WASHINGTON — A wall of national flags stands in the lobby of the National Museum of American Diplomacy in Washington, D.C., Tuesday, Oct. 6, 2026, with a visitor entering the hall beyond. The "Diplomacy Is Relationships" installation sits under the glass roof of the pavilion at the 21st Street NW entrance of the Harry S Truman Building, the State Department headquarters in Foggy Bottom. At left, a plaster-cast Great Seal of the United States hangs on the lobby wall near a welcome panel. The museum reopened

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