Cardiff Castle
From Tardis Wiki, the free Doctor Who reference
Cardiff Castle, also known as the City Centre was a castle in Cardiff. Cardiff Castle was scheduled to be demolished for the Blaidd Drwg project. (DW: Boom Town) However, although the nuclear power plant was built, Cardiff Castle was still standing. (TW: Everything Changes)
John Hart took Jack Harkness to the Castle to give him a good view of Cardiff's bombings. (TW: Exit Wounds)