HAMBURG, GERMANY - JULY 21:  Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge visit the Hamburg Elbphilharmonie with General and Artistic Director of the Elbphilharmonie and Laeiszhalle (R) Christoph Lieben-Seutter and the First Mayor of Hamburg Olaf Scholz (L) during day three of their official visit to Germany after two days in Poland on July 21, 2017 in Hamburg, Germany.  (Photo by Timm - Pool/Getty Images)