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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.
The Duke and Duchess of Cambridge are to visit the Tower of London to see the thousands of ceramic poppies which have been planted in memory of British soldiers who fell in the First World War.
The royal couple will be accompanied by Prince Harry in an official opening of the Blood Swept Lands and Seas of Red art installation- to mark 100 years since the conflict began.
Volunteers from across the country have so far placed 120,000 ceramic flowers in the moat of the Tower.
By November 11, 888,246 poppies are expected to be planted around the historic landmark.
Lights across Britain have been switched off for an hour tonight in a tribute to the 17 million killed in the First World War.
Landmarks including the Houses of Parliament, Tower Bridge and St Paul's Cathedral all went dark from 10pm.
Prime Minister David Cameron had asked Britons to switch off all but a single light in their homes for an hour.
A single candle has been placed outside Number 10 ahead of the Lights Out campaign.
The 14-18 NOW Lights Out campaign hopes people will leave a single light on between 10 and 11pm to mark the exact hour when Britain declared war on Germany.
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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.