VIENNA, AUSTRIA - APRIL 06:   Camilla, Duchess of Cornwall views the horses during her visit to the Spanish Riding School in Vienna during the second day of her visit to Austria, on April 6, 2017 in Vienna, Austria.   Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall are on the last of a nine-day tour of Europe.  (Photo by John Stillwell - Pool/Getty Images)