Berlin
From Tardis Wiki, the free Doctor Who reference
Berlin was the capital of Germany and its largest city.
In 1938, the Eleventh Doctor crashed the TARDIS in Berlin. (DW: Let's Kill Hitler)
In 1939, the Seventh Doctor and Ace visited Berlin. (NA: Timewyrm: Exodus)
Jack Harkness and Christopher Isherwood went cruising on Kurfürstendamm when they were in Berlin. (TW: Reset)