Open House weekend takes place every year and gives the public the chance to see inside over 600 architecturally significant buildings which are not generally freely open to all.
It aims to raise awareness of great buildings and invites people to understand, explore and appreciate architecture in London. More information about Open House can be obtained from Open House London (external website)
Open House Weekend in 2013 will be happening on the 21 and 22 September. Details of what visitors can see on each day, as well as opening times and other useful information, will follow.
Parliament is open to all UK residents. They can watch debates or book a tour of the Commons or Lords Chambers.
Lost in the wilds of Westminster? Find your bearings with our maps of the parliamentary estate and the surrounding area.
Can't visit Parliament in person? Why not climb the Elizabeth Tower, have a look around the Commons or visit the House of Lords library with this series of online tours.