Britain's most famous landmarks including the London Eye, Houses of Parliament, Downing Street and Gateshead's Millennium Bridge were plunged into darkness for an hour last night to mark the moment Britain first declared war on Germany in 1914.
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.
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.
Lights on some of Britain's most famous landmarks were extinguished between 10pm and 11pm to remember those who died in WWI.