Museum and Library of the Royal Armouries

The Tower of London was originally constructed in the 11th century as a fortress and has remained in periodic use particularly during times of civil disorder, as well as being a royal residence.

The Tower served several important administrative functions, housing the Privy Wardrobe, one of the departments of the Royal Household, until the mid 15th century; the Royal Mint until 1812; and the Public Record Office until the 1850s. It had an important military function, not only was it the most important arsenal in the kingdom, but also the home of the Board of Ordnance, the government department responsible for the supply of munitions and equipment to the army and navy, until its abolition in 1855.

The Tower was also used as a state prison up until the mid 17th century, and then again during the First and Second World Wars. It is particularly well known as the place of execution of two Queens of England, Anne Boleyn (1535) and Catherine Howard (1542). It was also the original home of the Royal Observatory (before it moved to Greenwich), and the King's Menagerie (the last of the animals were relocated to London Zoo in 1834). It is currently the repository of the Crown Jewels.

At its height the Tower was a thriving community under the control of the Constable and his Lieutenant. It had a large temporary population made up of the officers and workers of the Board of Ordnance and the Royal Mint, but also a significant permanent population, including the military garrison and the yeomen warders, and their families. The Tower also had its own doctor, hospital, and chapel.

The Tower was first opened to the public in 1660, but its development as a visitor attraction dates to the mid 19th century. It was then that the first official guidebooks appeared, the Jewel House was opened to visitors, and the displays of the Tower Armouries (now the Royal Armouries), where placed on a more academic basis.