Her Majesty’s Royal Palace and Fortress, more commonly known as the Tower of London (and historically as The Tower), is a historic fortress and scheduled monument in central London, England, on the north bank of the River Thames. It is located within the London Borough of Tower Hamlets and is separated from the eastern edge of the City of London by the open space known as Tower Hill. It is the oldest building used by the British government.   The Tower of London is often identified with the White Tower, the original stark square fortress built by William the Conqueror in 1078. However, the tower as a whole is a complex of several buildings set within two concentric rings of defensive walls and moat. The tower's primary function was a fortress, a royal palace, and a prison (particularly for high status and royal prisoners, such as the Princes in the Tower and the future Queen Elizabeth I). This last use has led to the phrase sent to the Tower (meaning imprisoned). It has also served as a place of execution and torture, an armoury, a treasury, a zoo, the Royal Mint, a public records office, an observatory, and since 1303, the home of the Crown Jewels of the United Kingdom. Today the Tower of London is cared for by an independent charity, Historic Royal Palaces, which receives no funding from the Government or the Crown. The Tower is located in the London Borough of Tower Hamlets, at the eastern boundary of the City of London financial district, adjacent to the River Thames and Tower Bridge. Between the river and the Tower is Tower Wharf, a freely accessible walkway with views of the river, tower and bridge, together with HMS Belfast and London City Hall on the opposite bank. The nearest London Underground station is Tower Hill on the Circle and District Lines. The nearest Docklands Light Railway station is Tower Gateway. London Fenchurch Street is a nearby National Rail station. River cruise boats and Thames Clipper services stop at the Tower ...