Geneva
From Tardis Wiki, the free Doctor Who reference
Geneva was a city in Switzerland where the international headquarters for UNIT and for the International Space Command were located (TV: The Tenth Planet). During the Brigadier's tenure with UNIT he consulted frequently by phone with Geneva. (TV: Spearhead from Space)
- The location of UNIT's central headquarters in Geneva presumably has to do with the number of United Nations organisations centred there.