Edinburgh

Edinburgh was the capital city of Scotland. The Tenth Doctor's companion, Heather McCrimmon, was from Edinburgh and studied at the city's university.

The Tenth Doctor and Martha Jones visited Edinburgh in 1759, where they met Alexander Monro and prevented the Kith from killing everyone in the city. (PROSE: The Many Hands)

The Sixth Doctor and Evelyn Smythe visited Edinburgh in December 1827. (AUDIO: Medical Purposes)

The Tenth Doctor later visited Edinburgh in 2010, where he had his final battle with the Mozhtratta. (COMIC: Dead-line)

Alternate timeline
In an alternative timeline, the Fifth Doctor, Peri Brown and Erimem visited the city. (PROSE: Graham Dilley Saves the World)