The Duke And Duchess Of Cambridge Visit Poland - Day 2 [Getty Images]

GDANSK, POLAND - JULY 18: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge meet former prisoners of the Stutthof concentration camp 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)

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