Britain's Prince William, Duke of Cambridge(L)and Catherine, Duchess of Cambridge gesture as they walk during their visit to The Taj Mahal in Agra on April 16, 2016. 
Prince William and his wife Kate arrived at the Taj Mahal, wrapping up their week-long trip to India and Bhutan with a visit that carries poignant echoes for Britain's royal family. / AFP / PRAKASH SINGH        (Photo credit should read PRAKASH SINGH/AFP/Getty Images)