London Underground
From Tardis Wiki, the free Doctor Who reference
The London Underground is a system of trains running underneith London. In around 1970 the platforms and tunnels of the system were used by the Great Intelligence to pull in the Doctor and his companions Jamie McCrimmon and Victoria Waterfield in the TARDIS and have them attacked by it's robotic yetis.(DW: The Web of Fear)
Sarah Jane also has to save the Underground from a terrorist attack in Test of Nerve. Also the Doctor visits Aldgate underground station because it passes close to the chamber where the waterhive are holding their prisoners. (TDA:The Feast of the Drowned) There are parts of the Torchwood Hub which built in a similar style to the old underground stations. (TW:Everything Changes onwards)
