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It's an breath-taking image that commemorates those who died in the Great War - thousands of ceramic poppies surround the Tower of London, where a hundred years ago, some of the first volunteers enlisted.
Eventually there will be one poppy for each serviceman from Britain and the Colonies who died - creating a stunning 'field'of nearly 900 thousand 'blooms'. Today even the Royals were captivated by the display, as Royal correspondent Tim Ewart reports:
Princes William and Harry and the Duchess of Cambridge paid a visit to the Tower of London today as part of the commemoration of the First World War centenary.
The trio chatted to staff and the famous Beefeaters at the site, which is one of London's oldest buildings.
The grounds of the tower were specially covered with poppies to commemorate 100 years since the beginning of the conflict that claimed over 1 million British lives.
The Tower was one of a number of famous monuments that turned out their lights to mark the centenary.
The Duchess of Cornwall joined senior politicians tonight for a service of solemn commemoration for those who died in WWI at Westminster Abbey.
Key figures present included Deputy Prime Minister Nick Clegg, former foreign secretary William Hague, Labour leader Ed Miliband and Metropolitan Police commander Sir Bernard Hogan-Howe.
The Duchess lit a candle during the service, as did the 1,700 others in the congregation.
The service also included the gradual extinguishing of candles, with an oil lamp snuffed out at the grave of the unknown warrior at 11pm - the exact hour war was declared.
In the same hour, the nation had been urged to switch off lights in places of worship, public buildings, workplaces and homes, and leave one light burning as a symbol of hope in darkness.
A family has for the first time visited the grave of a relative who was killed during the First World War.
ITV News correspondent Nina Nannar reports:
Government departments have posted pictures on Twitter as they took part in the Lights Out event to commemorate the First World War.
Coleen Rooney and Phillip Schofield have joined the hundreds of people taking part in the Lights Out event to mark the moment Britain joined the First World War.
Royalty, political leaders and relatives of fallen soldiers united tonight to remember the sacrifices and losses 100 years on from Britain's entry into the First World War.
A moving twilight ceremony at St Symphorien military cemetery near Mons, Belgium, was the highlight of a day of events.
ITV News Europe Editor James Mates reports from Mons:
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As the Lights Out event to remember those who fought and died in WWI happened last night ITV asked our viewers what they did to take part.