Berlin

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)

In the 1960s, Jack Harkness and Christopher Isherwood went cruising on the Kurfürstendamm when they visited Berlin. (TW: Reset)