Number 10 Downing Street will join the annual showcase of architectural design – Open House London – joining more than 800 buildings taking part in the celebration.
For one weekend (September 21-22) people will be able to gain access to buildings that are normally locked up tight. This year, Battersea Power Station, the London Eye, the Gherkin and Gray's Inn will be open for viewings, as will The View from The Shard.
The concept of Open House has really taken off, cities including New York, Buenos Ares, Melbourne and Tel Aviv now offer similar one-off peeks behind the doors of their most iconic buildings.
As well as the open houses there will also be a host of expert talks, guided walks and cycle rides to get involved in.
To take part in the free viewings and events, register before September 13 and your name will go in a ballot. For more information see www.openhouselondon.org.uk
Visit London and other Open House cities this month with Radio Times Travel, see here for more details