Torchwood Tower

One Canada Square in Canary Wharf in London was also known as Torchwood Tower. Circa 2007 it served as the Headquarters of the Torchwood Institute.

History
The tower was built to reach the height of the radar black spot later determined by the Institute to constitute an anomaly in space and time. The Torchwood Institute set out to investigate and, if possible, exploit the phenomenon. The true nature of the tower and the existence of Torchwood itself would remain unknown to the public. Torchwood 1 would later base itself out of the tower.

Other sections of the Tower acted as testing grounds for technology derived from alien artefacts. Torchwood was involved in experimental "ghost shifts" which opened up the Void and allowed the Cybermen of another world to enter this universe. A golden levitating sphere, actually a Void Ship, appeared at the spot. The Void ship contained the Cult of Skaro, Dalek leaders originally from this universe, who had escaped into the Void to survive the Last Great Time War, who clashed with the Cybermen in the conflict known as the Battle of Canary Wharf. The Doctor discovered a way to make it so that anything touched by the Void would return there, including every Cyberman from the other world and every Dalek. This, as well as the battle itself, ruined the tower. (DW: Army of Ghosts / Doomsday)

Other information
Ianto Jones and his lover, Lisa Hallett, both of whom worked for Torchwood 1, both managed to escape from the buidling. before its destruction. Lisa, at this stage, had already gotten partially cyber-converted. (TW: Cyberwoman)