London architecture covers a huge variety of styles, with buildings hundreds of years old standing alongside outstanding examples of contemporary design. While many of the buildings are accessible to the public through their role as, for example, museums, theatres and transport hubs, many are off-limits.
Every year for the last 17 years, however, hundreds of the capital's buildings open to the public for one weekend only, providing a unique opportunity to take a peek behind doors that are usually kept firmly shut.
London's mayor Boris Johnson says of Open House: "The contrasts of London's architecture are the genius of its beauty. No other city in the world brings together so well the historic and the new, or can delight the eye with a range of styles."
The website has an excellent searchable database of 730 buildings and events, enabling you to carefully plan where to go over the weekend.
Some venues will be hosting special events, ideal for the whole family - Trinity Buoy Wharf in London Docklands, for example, will be putting on exhibitions, tours, workshops and live entertainment, starting at eleven in the morning on both Saturday and Sunday.
Whether you're an architectural enthusiast or just curious about what's behind the walls of some of London's most famous and not-so-famous buildings, London Open House is your best chance to take a look and find out more.