From across the UK and the world thousands of people are descending on the Olympic Park in east London in the final moments before tonight's Opening Ceremony.
The sense of excitement and anticipation among the crowd comes after seven years of planning. It's a moment many at the site in Stratford simply did not want to miss.
The man in charge of tonight's show is Danny Boyle.
- 15,000 volunteers will bring to life a £27 million extravaganza
- It promises to celebrate Britain's history and culture
- A worldwide audience of a billion people are expected to watch
With final rehearsals underway, Danny Boyle sent this tweet.
London 2012 has been aptly described as the greatest sporting show on earth but the event also give Britain the chance to strengthen its diplomatic, political and economic ties with the rest of the world.
That process began tonight as The Queen and Duke of Edinburgh hosted presidents, prime ministers and princes from across the globe at Buckingham Palace.
Just a few hours before the opening ceremony, dozens of limousines began arriving at the Palace.
Among those invited were US First Lady Michelle Obama, Brazilian President Dilma Rousseff, French Prime Minister Jean-Marc Ayrault, Italian President Giorgio Napolitano and Jamaican Prime Minister Portia Simpson Miller, who wants to end the tradition of her country having a British monarch as head of state.
The start of the Olympic Games is also being celebrated at the country's second biggest Olympic venue. Down on the Dorset coast in Weymouth, is the centre for sailing events which Britain has dominated in recent Games. Lewis Vaughan Jones is there.