Some of these buildings - our perennial favourites - have been part of Open house since the first weekend in 1992

• 
  30 St Mary Axe (The Gherkin)

  Foster + Partners, 2003

  City of London

  Sat 16 & Sun 17
• 
  BT Tower

  GR Yeats, Eric Bedford, Min of Public Buildings & Works, 1965

  Camden

  Sat 16 & Sun 17
• 
  Barbican Centre

  Chamberlin Powell & Bon, 1963

  City of London

  Sun 17
• 
  Foreign & Commonwealth Office

  Sir George Gilbert Scott & Matthew Digby Wyatt, 1861

  Westminster

  Sat 16 & Sun 17
• 
  Former Conservative Club (HSBC offices)

  Sidney Smirke & George Basevi, 1844

  Westminster

  Sat 16
• 
  Freemasons' Hall

  Ashley and Newman, 1927

  Camden

  Sun 17
• 
  HM Treasury

  John Brydon & Sir Henry Tanner, 1917

  Westminster

  Sat 16 & Sun 17
• 
  Marlborough House

  Sir Christopher Wren, Sir James Pennethorne, 1709

  Westminster

  Sat 16
• 
  Royal Courts of Justice

  G E Street, 1874

  Westminster

  Sat 16
• 
  Union Chapel

  James Cubitt, 1877

  Islington

  Sat 16 & Sun 17