The beam of light as seen from The View From The Shard(01 of38)
Open Image ModalHere’s what the installation looks like from ground level.(02 of38)
Open Image Modal (credit:Oli Scarff via Getty Images)
A symbol of hope amid darkness(03 of38)
Open Image Modal (credit:JUSTIN TALLIS via Getty Images)
'Spectra' by Ryoji Ikeda (04 of38)
Open Image ModalSimply stunning... (05 of38)
Open Image Modal (credit:Oli Scarff via Getty Images)
The Lights go out on Nelson column in Trafalgar square (06 of38)
Open Image ModalThe spectacular beam will be visible every night 4 - 11 August(07 of38)
Open Image ModalA powerful mark of respect from London(08 of38)
Open Image Modal (credit:Oli Scarff via Getty Images)
The beam could be seen all across the city(09 of38)
Open Image Modal (credit:Oli Scarff via Getty Images)
Birds appeared to sparkle in the beam of light(10 of38)
Open Image ModalThe lights are turned off at London's Houses of Parliament(11 of38)
Open Image Modal (credit:JUSTIN TALLIS via Getty Images)
Big Ben strikes 2300 hours as the lights are turned off (12 of38)
Open Image Modal (credit:Rob Stothard via Getty Images)
A single window is illuminated in Buckingham Palace(13 of38)
Open Image Modal (credit:Matthew Lloyd via Getty Images)
People gather beside the Cenotaph (14 of38)
Open Image Modal (credit:JUSTIN TALLIS via Getty Images)
A single illuminated lantern is left outside the door of 10 Downing Street(15 of38)
Open Image Modal (credit:JUSTIN TALLIS via Getty Images)
A 'roll of honour' commemorating more than two thousand residents from London's Westminister borough(16 of38)
Open Image Modal (credit:JUSTIN TALLIS via Getty Images)
The Houses of parliament in London before the lights have been turned off... (17 of38)
Open Image Modal (credit:Ian West/PA Wire)
.... and after(18 of38)
Open Image Modal (credit:Ian West/PA Wire)
The Houses of Parliament are seen in darkness(19 of38)
Open Image Modal (credit:Tristan Fewings via Getty Images)
The London Eye is seen from Westminster Bridge as the lights are turned off(20 of38)
Open Image Modal (credit:Tristan Fewings via Getty Images)
People sit in candle light during a Vigil of Prayer and Penitence at Bath Abbey(21 of38)
Open Image Modal (credit:Ben Birchall/PA Wire)
Members of the Jewish community attend a ceremony at the Bevis Marks Synagogue (22 of38)
Open Image Modal (credit:Dan Dennison via Getty Images)
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Open Image ModalThe London Eye on has its lights switched off as part of the national Lights Out campaign of remembrance, marking 100 years since Britain entered the First World War. (credit:David Parry/PA Wire)
Lights Go Out To Mark World War One Centenary(24 of38)
Open Image ModalAn art installation entitled 'spectra' by Japanese artist Ryoji Ikeda lights up the night sky as part of 'Lights Out', to commemorate the centenary of Britain's involvement in the First World War, on August 4, 2014 in London, England. Monday 4th August marks the 100th anniversary of Great Britain declaring war on Germany. In 1914 British Prime Minister Herbert Asquith announced at 11pm that Britain was to enter the war after Germany had violated Belgium neutrality. The First World War or the Great War lasted until 11 November 1918 and is recognised as one of the deadliest historical conflicts with millions of causalities. A series of events commemorating the 100th anniversary are taking place throughout the day. (Photo by Oli Scarff/Getty Images) (credit:Oli Scarff via Getty Images)
Chelsea pensioners light their candles during a candlelight vigil at Westminster Abbey(25 of38)
Open Image Modal (credit:WPA Pool via Getty Images)
World War I centenary - London(26 of38)
Open Image ModalThe London Eye on Londonâs South Bank with its lights on after its lights switched off as part of the national âLights Outâ campaign of remembrance, marking 100 years since Britain entered the First World War. (credit:David Parry/PA Wire)
Lights Go Out To Mark World War One Centenary(27 of38)
Open Image ModalMembers of the public admire an art installation entitled 'spectra' by Japanese artist Ryoji Ikeda which lights up the night sky as part of 'Lights Out', to commemorate the centenary of Britain's involvement in the First World War, on August 4, 2014 in London, England. Monday 4th August marks the 100th anniversary of Great Britain declaring war on Germany. In 1914 British Prime Minister Herbert Asquith announced at 11pm that Britain was to enter the war after Germany had violated Belgium neutrality. The First World War or the Great War lasted until 11 November 1918 and is recognised as one of the deadliest historical conflicts with millions of causalities. A series of events commemorating the 100th anniversary are taking place throughout the day. (Photo by Oli Scarff/Getty Images) (credit:Oli Scarff via Getty Images)
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Open Image ModalCandles placed in specially made glass poppies are displayed on the war memorial during an evening 'Light's Out' ceremony
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Open Image ModalA woman sings a hymn during an evening 'Light's Out' ceremony on August 4, 2014 in Yarm, United Kingdom.
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Open Image ModalHundreds of people attend an evening 'Light's Out' vigil on August 4, 2014 in Yarm, United Kingdom.
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Open Image ModalCandles placed in specially made glass poppies are laid out on the war memorial during an evening 'Light's Out' vigil
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Open Image ModalCandles placed in specially made glass poppies are displayed on the war memorial during an evening 'Light's Out' ceremony
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Open Image ModalArmy cadets listen during a service as they attend an evening 'Light's Out' vigil on August 4, 2014 in Yarm, United Kingdom
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Open Image ModalCandles placed in specially made glass poppies are displayed on the war memorial during an evening 'Light's Out' ceremony on August 4, 2014 in Yarm, United Kingdom
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Open Image Modalhis combination image shows the London Eye illuminated as normal (L) and after the lights are turned off (R) to mark the centenary of the outbreak of World War One on August 4, 2014 in London, England.
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Open Image ModalA man lights a candle on the war memorial on August 4, 2014 in Bishop's Stortford, United Kingdom. Monday 4th August marks the 100th Anniversary of Great Britain declaring war on Germany. In 1914 British Prime Minister Herbert Asquith announced at 11pm that Britain was to enter the war after Germany had violated Belgium's neutrality. The First World War or the Great War lasted until 11 November 1918 and is recognised as one of the deadliest historical conflicts with millions of casualties. A series of events commemorating the 100th Anniversary are taking place throughout the day. (Photo by Mary Turner/Getty Images)
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Open Image ModalMembers of the public surround the candlelit war memorial, marking the centenary of the start of World War One on August 4, 2014 in Bishop's Stortford, United Kingdom.
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Open Image ModalA photograph of George Parlett who enlisted in the Devon Regiment on 29th September 1914, sits beside a candle and remembrance cross on the war memorial in Bishop's Stortford, United Kingdom. Monday 4th August marks the 100th Anniversary of Great Britain declaring war on Germany.