23 February 2011
Last updated at 13:35
New images have been released by London 2012 Olympics organisers Locog, showing the progress at Olympic Park, 17 months out from the Games.
They show how the site is changing, as the build on venues to be handed over by summer 2011 nears completion.
The Olympic Stadium is structurally complete, the roof and all spectator seats are installed. The black and white graphic designs on seating can be seen through the plastic covers.
At competition level, the central field of play is ready for the turf to be installed and the running track to go in.
The velodrome became the first Olympic Park venue to open, with Olympic cyclists taking to the boards.
At the Aquatics Centre, the permanent structures are in place. Work continues on areas including the temporary seating stands, ceiling, dive boards and tiling. The National Audit Office has warned that timing is tight for the July handover date.
More than three-quarters of the residential plots in the Athletes' Village are structurally complete, Locog says.
A third of the 12,000 seats remain to be installed inside the temporary structure of the basketball arena. The court's concrete base has been poured into place.
Landscaping is taking root on the 250 acres of parkland around the main Games venues.
Meadows have been sown around the Olympic Stadium. More than 1,500 trees and thousands of wetland plants have been planted.