Dutch King Willem-Alexander and Queen Maxima stand on a ferry as they pass Australia's iconic land marks, the Opera house (L) and Harbour bridge, on their way to Cockatoo Island in Sydney on November 3, 2016.
The Dutch royals are in Australia to mark the 400th anniversary of explorer Dirk Hartog's landing in Western Australia and the unveiling of Hartog's plate, which is the oldest existing relic of European exploration in Australia. / AFP / SAEED KHAN        (Photo credit should read SAEED KHAN/AFP/Getty Images)