Britain's Prince William (2ndL), Duke of Cambridge, his wife Kate, the Duchess of Cambridge (2ndR), Mayor of Hamburg Olaf Scholz (L) and museum director Peter Tamm walk at the entrance of the Elbphilharmonie concert hall in Hamburg, northern Germany, on July 21, 2017.
 The British royal couple are on the last stage of their three-day visit to Germany. / AFP PHOTO / POOL / Christian Charisius        (Photo credit should read CHRISTIAN CHARISIUS/AFP/Getty Images)