More than 4,000 beacons will be lit across the globe in celebration of Britain's Queen Elizabeth's Diamond Jubilee.
The 85-year-old monarch - who has been on the throne for 60 years this year - will light the final beacon from the concert stage on June 4 where many stars will be performing in her honour.
After singers such as Sir Elton John, Sir Paul McCartney and Robbie Williams have performed in the shadow of Buckingham Palace, the queen will walk out in front of the crowds to set the national beacon ablaze.
She will carefully place a diamond, made from crystal glass, into a special pod at 10.30pm, triggering the lighting of the last beacon nearby in The Mall.
Bruno Peek, Pageantmaster of the Queen's Diamond Jubilee beacons, said: "Our aim was to light 2,012 beacons because 2,012 have never been lit before, but by the end of the night we will have over 4,000 - that's truly amazing.
"Last night was the closing date for the beacons and the number came to 3,986 but I've been emailed a spread sheet with 40 more.
"The beacons will be lit from around the world on Monday, June 4 from Tonga to the Falkland Island and Malta to Kenya.
"I've been coordinating events like this for 30 years. But this year's celebrations will be the biggest. At 10.30pm, Her Majesty will light the national beacon at Buckingham Palace, sending a burst of light out across crowds on The Mall."
The network of beacons that will criss-cross the UK will be placed on historic landmarks, hill-top vantage points and famous mountains.
More than 3,800 beacons will be lit across the Commonwealth and in overseas territories on the night of June 4.