- You may be looking for the planet.
Barcelona was a city in Spain. The Eighth Doctor, Fitz Kreiner and Anji Kapoor visited Barcelona in 1937. It was largely inaccessible by sea due to blockades by various factions in the Spanish Civil War. (PROSE: History 101)
Barcelona was one of ten major cities across the world, all of which had underground railways, where Coldfire Construction built a reactor within a period of 18 months as part of a plot by the Slitheen to drain the Sun's energy, operated by at least one Slitheen disguised using a skin suit made from a local. At somepoint in 2008, after Sarah Jane Smith foiled the Slitheen with the help of her friends at Park Vale Comprehensive School at Ealing in London, she contacted UNIT so they would clear up the Coldfire sites. (TV: Revenge of the Slitheen)