The British Library, in Euston, is the national library of the United Kingdom.
Prior to 1973, it was part of the British Museum.
It holds over 150 million items in all known languages and formats, including 25 million books, comprising a copy of every book produced in the United Kingdom.
It is free to visit, and the section probably of most interest to tourists and occasional visitors is the Sir John Ritblat Gallery, where items such as the Magna Carta, the original manuscript of Jane Eyre, Chaucer's Canterbury Tales and Viriginia Woolf's Mrs Dalloway can be seen on display.
Nearest underground stations: Euston, Kings Cross
St Pancras Station
From both the outside and inside, St Pancras station is one of the most remarkable looking buildings in London.
It is famous for its Victorian Gothic architecture and as such, has been used in several films including the Harry Potter series and The Ladykillers.
The original station was opened in 1868.
It has recently been reopened following a major refurbishment which included the transfer of London's Eurostar terminal from Waterloo.
It is now home to the longest champagne bar in the world.
Nearest underground station: St Pancras
place map and aerial view
The National Archives
The National Archives, at Kew in west London, is the official archive for England, Wales and the central UK Government, containing over 1,000 years of British history.
It holds around 9.5 million items, including court and government papers from the Norman Conquest to the present, census material, wills and military records.
As well being able to access their extensive database online, it is possible to visit the Archives to view particular documents on site.
Many people visit it for research and family history - if you do intend visiting, its worth planning your visit in advance and ordering documents online first.
Nearest underground station: Kew Gardens
Houses of Parliament
Officially the Palace of Westminster, the Houses of Parliament is where the two Houses of the Parliament of the United Kingdom meet to debate policy and issues of the day.
The House of Commons is themed green and the House of Lords is themed red. This extends from the seating covers through to the carpets, which change colour at the point where the houses physically meet. The palace is one of the largest parliament buildings in the world, with 1200 rooms and 100 staircases.
It is possible to visit the Houses of Parliament in various ways - the easiest being to either request tickets from your MP if you are a British citizen or to queue up outside St Stephen's entrance on the day of debates.
Nearest underground station: Westminster
The intriguing building on the south side of the Thames next to Vauxhall bridge is the home of MI6, or more properly Britain's Secret Intelligence Service. SIS is tasked by the British Government to collect intelligence world-wide in support of its security, defence, foreign and economic policies.
It is not possible to visit the building itself.
Nearest underground station: Vauxhall
place map and aerial view
The Silver Vaults
London's silver vaults originate from the Chancery Lane Safe Deposit Company, which was established in 1885.
They are home to over 30 underground shops selling all sorts of silverware, both antique and modern.
It makes for a pleasant afternoon's browsing, in an interesting venue.
Nearest underground station: Chancery Lane