Budapest
Budapest was the capital of Hungary. It was the location of the famous Buda Castle where Vlad the Impaler was once imprisoned. The river Danube flowed through Budapest. (AUDIO: The Labyrinth of Buda Castle)
The Fourth Doctor and Romana II encountered the vampire Zoltán Frid in Budapest in 1980. (AUDIO: The Labyrinth of Buda Castle)
During the Year That Never Was, Martha Jones claimed to have gone to Budapest to collect one of the vials of liquid needed to arm the gun with which she was allegedly preparing to kill the Saxon Master. (TV: Last of the Time Lords)
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 to the right is probably a good indicator of the DWU location of Budapest.
