Deadwood was a town in the Dakota Territory in the United States on Earth, and the name of an historical television series set in that town.
In 1878, Jack Harkness stole a gold nugget from a prospector in Deadwood only to lose it to John Hart. (AUDIO: The Death of Captain Jack)
The Eleventh Doctor and Clara visited Deadwood in 1882 to pay their respects to the the recently deceased Wild Bill Hickok. They met Oscar Wilde and Calamity Jane during their time there. (COMIC: Dead Man's Hand)
Deadwood was also the name of a television series which was broadcast in 2006. (PROSE: Only Human)