The 1-year countdown to the opening of the giant cocoon, part of the second phase of the Natural History Museum's landmark Darwin Centre, began in September 2008.
Watch the countdown video and see the inspiration behind the development and the building.
The new Darwin Centre took 280 people 25 months to build and cost £78 million and reveals the Museum's world-class science research from 15 September 2009 when it opened to the public.
When this video was made, the building was complete and staff were getting ready to fill it with the 20 million insect and plant specimens that are now housed there.
As well as being a new home to protect the Museum's important collections, the state-of-the-art building is now the workplace of hundreds of Museum scientists and a place of discovery for the public.
'Until now most of our science has been going on behind the scenes,' said Dr Michael Dixon, Director of the Natural History Museum. 'At the Darwin Centre, we will show the public more of both our vital research and our internationally important collections.'