Geneva was a city in Switzerland located close to the French border. (AUDIO: Death in Geneva)
It was perhaps best known for being home to UNIT Central Control (TV: Spearhead from Space, et. al.) and was a known location of UNIT HQ. (AUDIO: Death in Geneva) During the Brigadier's tenure with UNIT he consulted frequently by phone with Geneva. (TV: Spearhead from Space)
Geography
Geneva was home to UNIT Central Control, (TV: Spearhead from Space, et. al.) Space Command HQ, (TV: The Tenth Planet) as well as CERN headquarters. (AUDIO: Lost Souls)
Landmarks in Geneva included the Palace of Nations. The city also contained the University of Geneva. (AUDIO: Death in Geneva)
History
On 10 September 2008, CERN first tested their Large Hadron Collider, (TV: Extremis) accidentally opening a portal to another reality, and letting neutron eaters loose. Jack Harkness and his Torchwood Three team contained the threat. (AUDIO: Lost Souls)
In 2009, after the Saxon Master turned humanity into "the Master Race", he consulted with a UNIT officer in Geneva. (TV: The End of Time)
At some point in the 2010s, Colonel Vikram Shindi and Doctor Elizabeth Klein were stationed in Geneva as UNIT faced a Silurian invasion of Great Britain. (AUDIO: United)
Alternate timelines
During the Year That Never Was, which incorporated the Toclafane invasion, the population of Geneva was massacred. (TV: The Sound of Drums)
References
The CIA's files on the Torchwood Institute had referrals going back to Geneva and above. (TV: The New World)