Princess Diana exhibit in Philadelphia

Princess Diana exhibit in Philadelphia

"Diana: A Celebration" opened Friday at the National Constitution Center in Philadelphia. The exhibit runs through Dec. 31.

"Diana: A Celebration" opened Friday at the National Constitution Center in Philadelphia. The exhibit runs through Dec. 31.

Charles Spencer, Diana's brother, got to preview the exhibit. It explores the Princess of Wales' childhood, her engagement to Prince Charles, their 1981 wedding and her life and work as a humanitarian.

Visitors get a closeup look at Diana's wedding gown and its 25-foot train.

This is one of several tiaras Princess Diana had during her marriage.

Charles Spencer appeared on the "Today" show with some of the pieces from the exhibit, including an iconic black dress.

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"Diana: A Celebration" opened Friday at the National Constitution Center in Philadelphia. The exhibit runs through Dec. 31.

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