After years of planning and preparation, there are just 100 days to go until the London 2012 Games begin.
Organisers say they are ready to welcome the world and a series of events has been planned to highlight today's landmark as the countdown to the Games begins in earnest.
Many of the test events have already been held at the venues, but a big one comes on the first weekend of May with a cluster of events in the Olympic Park where 80,000 people are expected to attend, including 50,000 spectators in the Olympic Stadium to watch the London Disability Athletics Challenge.
Speaking to ITV News Ian Crockford the Project Sponsor at Olympic Delivery Authority dismissed suggestions that the Olympic Park still looked more like a building site.
Today's 100 day countdown is being marked across the world.
From Riga to Rangoon and Kingston to Kuala Lumpar, British diplomats are joining Olympic and Paralympic athletes today to mark 100 days to go until the London 2012 Olympic Games. Among today's main events:
In Miami one hundred people on one hundred bikes will take part in an Olympic themed community ride on South Beach.
In Istanbul six Turkish Olympians will take part in a 100 metre race in Istanbuls Taksim Square
In Caracas athletes from the Venezuelan Olympic and Paralympic team will race children from schools in underprivileged neighbourhoods
In Wellington there will be a 100 metre race from the New Zealand Parliament to the High Commission
UK Sport says it is also pumping a further £750,000 into Team GB's final Olympic preparations to try to boost hopes of a medal.
The money is around £1,000 per athlete allows for further training camps, additional coaches and extra equipment as the Games draw closer.
Labour says the success of the Olympics will not just be judged by the main event this Summer.