Located in the open space between Turnwise Broad Way and the Street of Small Gods, this derelict building was formerly a small castle and strongpoint. At the time of Jingo derelict and largely boarded up, it is unclear what the future holds for this building. It featured as a location in Jingo, where the Watch was led to believe that the assassin's arrow that felled Prince Khufurah was fired from its upper floors.
The Barbican, or at least its site, has since been refurbished as Government offices, the purpose of which is not specified. The Compleat Ankh-Morpork also draws attention to its convenient location opposite from the Patrician's Palace.