PHOTOS: Lights go out to honour WWI heroes

Lights across Britain switched off for an hour on Monday night in a tribute to the dead of World War I.

British landmarks, including the Houses of Parliament, Tower Bridge and St Paul’s Cathedral, went dark after Prime Minister David Cameron had asked Britons to switch off all but a single light in their homes for an hour.

A policeman stands guard as a lantern is placed at the front door of Number 10 Downing Street during ‘Lights Out’, as part of commemorations to mark the 100th anniversary of the outbreak of World War I in London.

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Light is beamed into the sky from Trafalgar Square to mark the 100th anniversary of the outbreak of World War I.

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People enjoy an artwork entitled ‘Spectra’ by Japanese visual artist Ryoji Ikeda during Lights Out, as part of commemorations to mark the 100th anniversary of the outbreak of WWI, in London.

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People observe a moment of silence near a war memorial in Westminster to mark the 100th anniversary of the outbreak of World War I in London.

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Britain’s Catherine, Duchess of Cambridge, and Prince Harry walk to lay lanterns during a 100th anniversary ceremony to commemorate the start of World War I at St Symphorien Military Cemetery in Mons, Belgium.

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The Houses of Parliament seen from WestminsterBridge before the lights are turned off on iconic buildings around London to mark the centenary of the outbreak of World War One on August 4, 2014 in London, England.