Liverpool

Liverpool was a British city.

In 1893, the Doctor in his eighth incarnation visited Liverpool. (EDA: Camera Obscura) Whilst in his first incarnation, the Doctor briefly visited Liverpool on 25th December 1965. (DW: The Daleks' Master Plan) The seventh incarnation of the Doctor visited Liverpool in the early 21st century. (PDA: The Hollow Men)

Liverpool was also the location where Bowie Base One's bulkheads were created in the 2050s. (DW: The Waters of Mars) At some point in the future relative to 1965, Liverpool became host to The Beatles' Memorial Theatre, which Vicki once visited. (DW: The Chase)

Behind the Scenes
Tom Baker, Maureen O'Brien, and Elisabeth Sladen were all born in Liverpool.