The Duke and Duchess of Cambridge were accompanied by Prince Harry to view the thousands of ceramic poppies which have been planted around the Tower of London.
The royal trio each planted a ceramic version of the flower in the Blood Swept Lands And Seas Of Red art installation to pay tribute to the British soldiers who fell during World War One.
The Tower's moat currently consists of 120,000 poppies but more will be added over the coming months until there are 888,246 on November 11.
Every poppy planted will mark each British and Colonial death during the war.
Prince William was heard telling the artwork's creator Paul Cummins, that the piece was "spectacular" before they joined him to climb the Middle Tower to view the artwork from up high.
Take a look at the pictures as London plunged into darkness last night, to pay tribute to those who lost their lives in World War One.
From a shortlist of nine, the Royal Air Force is inviting the public to choose an image that best represents the service.
Events across the UK and Belgium are taking place tomorrow to commemorate the centenary of the First World War.