GDANSK, POLAND - JULY 18:  Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge meet former prisoners of the Stutthof concentration camp, Manfred Goldberg (2nd, L) and Zigi Shpper (R) as they visit the former Nazi German concentration camp during an official visit to Poland and Germany on July 18, 2017 near Gdansk, Poland.  (Photo by Bruce Adams-Pool/Getty Images)