Prince William, Duke of Cambridge (Center L), and his wife Kate, Duchess of Cambridge (Center R), walk through the streets of the historic center of Heidelberg, besides Baden-Wuerttemberg's State Premier Winfried Kretschmann (2nd R) ans his wife Gerlinde (R), Heidelberg's Mayor Eckart Wuerzner (2nd L) and his wife Janine on July 20, 2017. The British royal couple is on a three-day visit in Germany. / AFP PHOTO / POOL / THOMAS KIENZLE (Photo credit should read THOMAS KIENZLE/AFP/Getty Images)
