Tower of London

The Tower of London was a prison, fortified royal residence, and UNIT base in London. The Doctor visited it on more than one occasion and was imprisoned there several times.

Henry VIII once sent the First Doctor to the Tower of London, which was where the Doctor wanted to be, as his TARDIS had also been taken there. (TV: "Strangers in Space")

Jane Grey was befriended 19–20 July 1553 by her new lady-in-waiting Rani Chandra, a teenage girl from 2010, whilst residing in the Tower during her brief reign. (TV: Lost in Time) The First Doctor assisted Lady Jane and was present at her execution at the Tower. (PROSE: The Nine-Day Queen)

The Sixth Doctor and Evelyn Smythe were imprisoned there by the order of Queen Mary I in 1555, who was under the erroneous impression that they were plotting to assassinate her and place her Protestant half-sister Elizabeth on the throne. (AUDIO: The Marian Conspiracy)

On a different occasion, he shared a cell with Sir Walter Raleigh. Though the event was recounted by the Third Doctor to Jo Grant, it was unclear which incarnation of the Doctor had spent time with Raleigh. (TV: The Mind of Evil)

The Eleventh Doctor was once imprisoned in the Tower without trial on the personal order of King Charles II. Two days later, a sphere twenty feet across was seen heading away from the tower carrying the Doctor. (TV: The Impossible Astronaut)

The Fifth Doctor would return to a cell there, this time with Nyssa, after falling foul of Sir Isaac Newton in the late 17th century. (AUDIO: Summer)

While exiled to Earth, the Third Doctor once helped the Brigadier track down an alien master of disguise who had a secret base at the Tower Hill Underground station. From this base, directly under the Tower, the thief hoped to gain access to the Crown Jewels. Although a combination of the Doctor, UNIT soldiers and Beefeaters were unable to capture the thief, they did prevent him from stealing the jewels. (COMIC: Secret of the Tower)

In 1979, the Fourth Doctor told his companion Leela that he had been imprisoned in the Tower with the Duke of Exeter's daughter. (AUDIO: Trail of the White Worm)

Ian Chesterton opined to the First Doctor that Frankenstein's House of Horrors at the 1996 Festival of Ghana (which they mistakenly believed to have been within a human mind) had more spooks than the Tower of London. (TV: The Chase)

By 2006, UNIT headquarters was located beneath the Tower of London. From there, Prime Minister Harriet Jones directed the responses of UNIT and Torchwood to the Sycorax invasion of Earth. (TV: The Christmas Invasion) The headquarters was still used in 2009, though UNIT also maintained mobile bases in lorry trucks. (TV: The Sontaran Stratagem)

In an alternative timeline, the Eleventh Doctor was imprisoned in the Tower by Caesar Winston Churchill on the perpetual 22 April 2011. (TV: The Wedding of River Song)

Circa 2020, Sir Alistair's daughter Kate Stewart summoned the Eleventh Doctor to the Tower to assist in UNIT's study of the newly-activated Cubes. (TV: The Power of Three)

When The Department controlled Britain around the year 2050, the Tower of London became Dauntless Prison, a prison for all the aliens that arrived on Earth. When K9 Mark 2 and his friends released the alien prisoners there in 2050, the Department's treatment of the prisoners was leaked to the media and the prison was shut down. (TV: Liberation)

Some time around the 29th century onwards, the tower or a new facility named for the original tower, was incorporated into Starship UK. Its dungeon contained the devices used to torture the star whale beneath the craft into moving. (TV: The Beast Below)