The United Nations building is a perfectly preserved homage to the go-getting 1950s–right down to its Mad Men-style interiors. A photo tour of off-limits areas.

Past the 104 white flagpoles outside the United Nations building last week rolled a fleet of limousines delivering diplomats to an autumn rite as familiar and often as shrill as the first day of ...

The U.S. Mission to the United Nations opened on March 19, 1946. First called the United States Delegation, its first home was in the Fisk Building on 57th Street.