In 1994, 'The Crow' was released in cinemas, despite lead actor Brandon Lee dying after an accident on set before filming was complete. New computer technology was used to place his character in missing scenes. Hear from the film's special effects supervisor, Andrew Mason.

(Photo: Brandon Lee as Eric Draven in 'The Crow'. Credit: Rex Features)

On 2 May 1982, the Argentine cruiser the General Belgrano was sunk by a British submarine during the war over the Falkland or Malvinas Islands. More than 300 Argentinians died. It was the single biggest loss of life of the war, and its sinking remains one of the most controversial actions of the conflict. We hear from one of the survivors of the Belgrano.

(Photo: the General Belgrano sinks in the South Atlantic watched by survivors from orange life-rafts. Credit: Associated Press)

In 1934 Mao Zedong led some eighty-six thousand communist followers on an epic journey across China to escape the nationalist forces of Chiang Kai-Shek. Tens of thousands died on the year-long retreat, which became known as the Long March. We hear from Zhong Ming, one of the few survivors still alive.

(Photo: Communist leader Mao Zedong (left) during the Long March. Credit: Keystone/Getty Images)

In April 2004, photographs were leaked to the US media showing American soldiers abusing Iraqi detainees at the military prison of Abu Ghraib. Witness hears BBC interviews with Lynndie England, who featured in many of the photos, and Joe Darby, the whistleblower who revealed the abuse.

Photo: Image obtained by The Associated Press which shows Pfc. Lynndie England holding a leash attached to a detainee in late 2003 at the Abu Ghraib prison in Baghdad, Iraq. (AP Photo)

In April 1945, thousands of Italians crowded into a Milan square to see the body of the wartime fascist dictator, Benito Mussolini. He, his mistress and his close associates had been shot by partisans, and their corpses strung up by their feet for all to see. We talk to the poet Franco Loi, who was in the crowd that day, and to an American journalist who has documented Mussolini's last days.

(Photo: Benito Mussolini (right) and Adolf Hitler (left) give the fascist salute at the Tomb of the Fascist Martyrs, Florence, 1938. Credit: Getty Images)

In April 1996, lone gunman Martin Bryant killed 35 people in the Australian town of Port Arthur. The deaths shocked the nation and resulted in major changes to the country's gun laws. Hear from John and Gaye Fidler, who survived the massacre, but lost three friends.

(Photo: The Broad Arrow Café, where the Port Arthur Massacre began. Credit: AP)

In 1930 protestors gathered in Qissa Khwani Bazaar to object to the the arrest of independence activist Khan Abdul Ghaffar Khan - also known as The Frontier Gandhi. The gathering in Peshawar was a non-violent one, but British soldiers opened fire and hundreds of people were killed.

We dip into the archives for a recording of a British colonial officer, Olaf Caroe, who gave his account of this violent episode in the story of Indian independence to the BBC in the 1970s.

Picture: Mahatma Gandhi with Pashtun leader Khan Abdul Ghaffar Khan, 1938 in Peshawar, during a political meeting. Courtesy of OFF/AFP/Getty Images

On 25 April 1974 a coup carried out by left-leaning army officers led the way to democracy in Portugal. The largely peaceful handover of power became known as the Carnation Revolution. Hear from Adelino Gomes, who was a young journalist in Lisbon at the time.

(Photo: A wall covered with murals and the words 25 April 1974 - 2014, marking the 40 year anniversary of the Carnation Revolution. Credit: AFP/Getty Images)

In April 1980, Robert Mugabe became the first prime minister of Zimbabwe - formerly Rhodesia. He had just won historic elections, ending years of white minority rule. We hear from Wilf Mbanga who was once part of Mr Mugabe's inner circle.

(Photo: Wilf Mbanga (centre) tells joke to Robert Mugabe (L) and Julius Nyrere of Tanzania (R) , Delhi, 1984. Credit: Bester Kanyama)

Senator Joseph McCarthy made it his mission to purge communists from American public life - but in April 1954 he was the subject of his own congressional hearing, after allegations that he had tried to blackmail the US Army into giving preferential treatment to one of his aides. Witness speaks to Norman Dorsen, one of the Army's junior legal advisors in the Army-McCarthy hearings.

(Photo: American politician Joseph McCarthy, Republican senator from Wisconsin, testifies against the US Army during the Army-McCarthy hearings, Washington DC, 9 June, 1954. McCarthy stands before a map which charts communist activity in the United States. Credit: Getty Images)