The Palais de Justice (French pronunciation: [palɛ də ʒystis]; '"Palace of Justice"), formerly the Palais de la Cité ("Palace of the City"), is located on the Boulevard du Palais in the Île de la Cité in central Paris, France.
Among the oldest surviving buildings of the former royal palace are the Sainte Chapelle (built c. 1240, during the reign of Louis IX) and the Conciergerie, a former prison, now a museum, where Marie Antoinette was imprisoned before being executed on the guillotine. The justice of the state has been dispensed at this site since medieval times. From the sixteenth century to the French Revolution this was the seat of the Parlement de Paris.
The building was reconstructed between 1857 and 1868 by architects Joseph-Louis Duc and Honoré Daumet. The exterior includes sculptural work by Jean-Marie Bonnassieux.
It was opened in October 1868 with little fanfare, save from a visit by Baron Haussmann, prefect of the Seine. It was awarded the Grand Prix de l'Empereur as the greatest work of art produced in France in the decade.
Security is maintained by gendarmes.
Coordinates: 48°51′21″N 2°20′42″E / 48.855722°N 2.345051°E