Washington DC was the federal capital city of the United States of America on Earth.
The Washington Dulles International Airport services the Washington DC metropolitan area. (TV: Rendition)
History
19th century
In August 1814, Washington DC was attacked by the invading British. The White House and the Library of Congress were both burned in the process. (AUDIO: Washington Burns)
On 11 April 1865, Abraham Lincoln gave his final public address in the wake of the end of the American Civil War. (PROSE: Blood and Hope) Four days later, the Sixth Doctor and Evelyn Smythe travelled to the city to fix history changes made by Robert Knox, including Lincoln's assassination. (AUDIO: Assassin in the Limelight)
20th century
In 1951, after being sequestered by intelligence agencies, the Eighth Doctor found himself needing to report to people in Washington, not long after visiting Moscow in Russia. (PROSE: Endgame) In 1969, the Eleventh Doctor helped President Richard Nixon to fight the Silence. (TV: The Impossible Astronaut / Day of the Moon) Amy and Rory Williams travelled from New York City to Washington D.C. of the same year to view the events of their past. They later told Chrissie Allen that they had been vacationing in Washington where they had friends and family who were going through a hard time. (PROSE: Summer Falls and Other Stories) Before 1997 Brigadier-General Adrienne Kramer met the seventh incarnation of the Doctor in Washington when it was about to disappear into a time rift. (PROSE: Vampire Science) In 1997, the Prime Minister of the United Kingdom was assassinated there on 6 May. (PROSE: The Dying Days)
21st century
Washington DC was one of ten major cities across the world, all of which had underground railways, where Coldfire Construction built a reactor within a period of 18 months as part of a plot by the Slitheen to drain the Sun's energy, operated by at least one Slitheen disguised using a skin suit made from a local. At somepoint in 2008, after Sarah Jane Smith foiled the Slitheen with the help of her friends at Park Vale Comprehensive School at Ealing in London, she contacted UNIT so they would clear up the Coldfire sites. (TV: Revenge of the Slitheen)
In 2009, Alan Jackson moved here with his daughter Maria Jackson from their old home in the Ealing district of London. (TV: The Last Sontaran) He then worked at the Head Office of CapitolSys Technologies in Washington DC. Chrissie Jackson and Ivan planned to come to Washington DC during their honeymoon. Chrissie wanted Maria to show her all the best shoe shops in the capital. (PROSE: The Last Sontaran) On Christmas Day 2009, President Barack Obama was giving a speech from the White House when, like everyone else, he was converted into a copy of the Saxon Master. (TV: The End of Time) Following Miracle Day, Dr Vera Juarez helped Rex Matheson recover from his punctured heart. (TV: The New World) She worked at a conference in City Hall to investigate the nature of the Miracle. (TV: Rendition) Rex, along with Esther Drummond later forcibly left the CIA in Langley to join Torchwood here, before heading for Los Angeles. (TV: Rendition, Dead of Night, Escape to LA) Discovering the passing of the categories of life by the US government, Dr Juarez also left for LA to meet up with Torchwood. (TV: The Categories of Life)
Later in the 21st century, Washington had a T-Mat centre. (TV: The Seeds of Death)
22nd century
In the 22nd century, Washington DC was attacked by CEREBRA, which took control of the minds of approximately 700,000 people in the city. However, it was defeated by the Seventh Doctor and Ace. (AUDIO: Washington Burns)
26th century
By the 26th century, Washington DC had been renamed Oceanic City. (AUDIO: Scorpius)
41st century
The Tenth Doctor visited the city in 4041 and battled the Klytode there. (COMIC: Return of the Klytode)
Alternate timeline
In an alternate 2106 where the New Dalek Paradigm invaded Earth starting with London using a piece of the Eternity Clock, Washington was among the major cities where Daleks were deposited to via transmat. (GAME: The Eternity Clock)
Behind the scenes
Location information
Though it's possible that a real world location doesn't exist in the same geographic space in the Doctor Who universe, such cases are few and far between. Thus, the map at right is probably a good indicator of the DWU location of Washington DC.
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