Princess Diana's wedding is still the standard by which all royal nuptials are judged by -- and even 30 years later, her dress is seen by many as the most memorable wedding gown of all time. Its 25-foot train, 10,000 mother-of-pearl sequins and acres of ivory satin are now making their way through the United States in an exhibition of 150 items belonging to the late princess. Duration: 01:48.