It is unusual for a court to be built on the site of a prison. Yet the Old Fort Prison, popularly known as Number Four, was deliberately chosen by the judges because of its painfuil past. Built in 1893 and decommissioned in 1983, it incarcerated hundreds of thousands of people, including famous figures such as M.K. Gandhi and Albert Luthuli. Nelson Mandela first went there as a young lawyer, then as a prisoner and finally as President of South Africa.