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Britain's Queen Elizabeth II (R) and Britain's Prince Philip, Duke of Edinburgh are shown Giant's causeway, a world heritage site near Bushmills in Northern Ireland during a two-day visit on June 28, 2016. (Photo by PAUL FAITH / AFP) (Photo by PAUL FAITH/AFP via Getty Images)

Britain's Queen Elizabeth II (R) and Britain's Prince Philip, Duke of Edinburgh are shown Giant's causeway, a world heritage site near Bushmills in Northern Ireland during a two-day  visit on June 28, 2016. (Photo by PAUL FAITH / AFP) (Photo by PAUL FAITH/AFP via Getty Images)