Have you ever wondered what actually goes on inside 10 Downing Street, the Treasury or Battersea Power Station? Well this weekend seven hundred buildings usually closed to the public will throw open their doors for the annual Open House.
The event offers a chance to see the inner workings of famous addresses as well as hidden gems - as Martin Stew reports.
Did you know there was a windmill in Brixton? Have you ever wondered what is actually inside Battersea Power Station?
This weekend you can find out at the Open House Event which sees more than 800 private buildings in the capital open their doors to the public.
Places like 10 Downing Street and the Shard are taking part but tickets were balloted earlier this month.
But do not despair! There are still 700 iconic buildings and homes that are completely free to visit this weekend.
Battersea Power Station is working on a first come, first serve basis this weekend. There will only be queuing if necessary.
Lloyds of London, is a key example of the British High -Tech architecture, and is also working on a first come, first serve basis. There may be queuing.
One of London's last surviving windmills is in Brixton. There are half-hourly tours this weekend that last 40 minutes. These must be pre-booked. Shorter tours. 20 minutes long are available though on a first come, first serve basis.
Battersea Power Station will be open to visitors for the last time for the annual Open House London weekend later this month.
The event over the weekend of 21st and 22nd September is free, and takes place between 11am and 4pm.
Rob Tincknell, chief executive of the Battersea Power Station Development Company, said:
"I wouldn’t be surprised if 10,000 people come over the weekend, if not more.”
It's only the second time the grade 2 listed building has been open to the public since its decommissioning in 1983. It's the last chance to see the boiler house and Turbine hall before the site's £8 billion redevelopment.
Ever wanted to get a glimpse inside some of London's most iconic buildings? Well this weekend you can do just that.
Open House London sees nearly 800 buildings throw open their doors to the public.
Hundreds of people have been queuing for hours already this morning to see one of London's tallest and certainly one of its most distinctive buildings - The Gherkin. The line had already stretched to Leadenhall Street by 10am this morning.
Are you participating in Open House London? Send us your pics via twitter @londontonight