Timbuktu
From Tardis Wiki, the free Doctor Who reference
Timbuktu was a location on Earth. (PROSE: Ten Little Aliens [+]Loading...["Ten Little Aliens (novel)"])
When Steven Taylor asked where the Monk was, the First Doctor said he didn't care even if he was in Timbuktu. (TV: The Daleks' Master Plan [+]Loading...["The Daleks' Master Plan (TV story)"])
Timbuktu was mentioned in the lyrics of the Spice Girls song, "Spice Up Your Life" (TV: The Giggle [+]Loading...["The Giggle (TV story)"])
