Britain's Prince Charles, left, smiles at the crowd outside of the Cathedral of The Assumption in Louisville, Ky., Friday, March 20, 2015. The Kentucky stop comes after a visit to Washington, D.C. (AP)
Britain's Prince Charles is greeted by a group of schoolchildren on his arrival at the Kentucky Center for African American Heritage in Louisville, Ky., Friday, March 20, 2015. The Kentucky stop comes after Charles and his wife Camilla visited Washington, D.C. (AP)
Britain's Prince Charles speaks with presenters at a display of technology at the Kentucky Center for African American Heritage in Louisville, Ky., Friday, March 20, 2015. The Kentucky stop comes after Charles and and his wife Camilla visited Washington, D.C. (AP)
Britain's Prince Charles examines a display on agriculture distribution before a roundtable discussion on agriculture at the Kentucky Center for African American Heritage in Louisville, Ky., Friday, March 20, 2015. The Kentucky stop comes after Charles and his wife Camilla visited Washington, D.C. (AP)
Britain's Prince Charles speaks to a presenter at a roundtable discussion on agriculture at the Kentucky Center for African American Heritage in Louisville, Ky., Friday, March 20, 2015. The Kentucky stop comes after Charles and his wife Camilla visited Washington, D.C. (AP)
Camilla, Duchess of Cornwall looks over a retired race horse in the paddock at Churchill Downs, home of the Kentucky Derby horse race, during her visit in Louisville, Kentucky March 20, 2015. Britain's Prince Charles and the Duchess of Cornwall are on a four day trip to the United States. (Reuters)
Camilla, Duchess of Cornwall (L) poses for a photo with Hall of Fame Jockey Pat Day (C) and his wife Sheila Day (R) at Churchill Downs, home of the Kentucky Derby horse race, during her visit in Louisville, Kentucky March 20, 2015. Britain's Prince Charles and the Duchess of Cornwall are on a four day trip to the United States. (REUTERS)
Camilla, Duchess of Cornwall looks over two small donkeys in the paddock at Churchill Downs, home of the Kentucky Derby horse race, during her visit in Louisville, Kentucky March 20, 2015. Britain's Prince Charles and the Duchess of Cornwall are on a four day trip to the United States. (Reuters)