Gibraltar

Henry Gordon Jago claimed to be "as solid as the Rock of Gibraltar". (TV: The Talons of Weng-Chiang; AUDIO: Higson & Quick)

In 1958, the Eleventh Doctor was imprisoned in Gibraltar by Sir Reginald Troupe. (COMIC: Tuesday)

Professor Zaroff told the Second Doctor that their location was west of Gibraltar, south of the Azores, on the Atlantic Ridge. From this information, the Doctor deduced that they were in Atlantis. (TV: The Underwater Menace)

Behind the scenes
Gibraltar was the fifth country and first European country to buy Doctor Who.