Aberdeen

Aberdeen was a city on the east coast of Scotland. It looked out over the North Sea. (TV: The Lie of the Land)

History
In the 2nd century, a Roman army invaded the area which would become Aberdeen. They were wiped out by a creature that fed on light and could destroy the Earth once it reached full power. The creature was defeated when the surviving Romans, along with the Picts and the Twelfth Doctor, Bill Potts and Nardole, drove the creature back into the portal where it came from. The rest of the Roman legion chose to stay in the portal to help fight off the rest of the creatures, the battle being heard in the 21st century due to the spatial differences between the portal and Earth (TV: The Eaters of Light)

Leela once referred to it as the "granite city", and the Fourth Doctor noted that in fact the granite emitted more radiation into the bodies of the residents of Aberdeen than would a nuclear power plant into its workers. (TV: Underworld)

In 1879, Queen Victoria was travelling to Aberdeen by coach when she was diverted by the Brethren. (TV: Tooth and Claw)

In the late 20th century, the Fourth Doctor dropped off Sarah Jane Smith in what he thought was South Croydon, but was actually Aberdeen. (TV: The Hand of Fear, School Reunion)

In the 22nd century, the Doctor had a cue card which read, "It's my fault, I should have known you didn't live in Aberdeen." (TV: Under the Lake)

Behind the scenes

 * In real life, though not specified in any script, Aberdeen is specifically in the northeast of Scotland. It is some 570 miles (928 kilometres) distant from Croydon.
 * According to non-narrative information in the DWBIT Daleks vs Cybermen Special, in 2007, the battle that began at Canary Wharf stretched as far as Aberdeen. A group of Cybermen hid in an alleyway and used one Cyberman as bait to lure in the Daleks. Once some Daleks arrived, the Cybermen emerged and attacked, managing to rip the dome off of one Dalek's casing. There was also a human casualty, while a report of the fight was taken by a Professor J B Shilling.