COPENHAGEN, DENMARK - JUNE 20:  Crown Prince Naruhito of Japan and Crown Princess Mary of Denmark at the harbour where they will take a boat trip through the channels to the Little Mermaid statute on June 20, 2017, Copenhagen, Denmark. Crown Prince Naruhito is on a 6-day visit to Denmark to commemorate 150 years of diplomatic ties. (Photo by Ole Jensen - Corbis/Corbis via Getty Images)