In 1937, Hitler and the Nazi party organised a huge exhibition of modern art in Munich. It was designed to ridicule works of art which they disapproved of - they called it Degenerate Art. It went on to be one of the best attended modern art exhibitions of all time.

Picture: Two men prepare to hang German Expressionist painter Max Beckmann's triptych 'Temptation' at the 20th Century German Art Exhibition at the New Burlington Galleries, London. The exhibition includes work by all the German artists pilloried by Adolf Hitler in the 'Degenerate Art' exhibition in Munich of 1937. (Photo by Topical Press Agency/Getty Images)

In November 1953 an English clergyman set up the first telephone helpline for people considering suicide. The Reverend Chad Varah began the pioneering service from a room in his own church house.

Today, the Samaritans receive more than five million calls every year in the UK alone. There are more than 100 branches overseas.

(Photo: The Reveren Chad Varah at the entrance to his office at the church of St Stephen, Wallbrook, City of London. Credit: PA)

On 31 October 1984, Indian Prime Minister Indira Gandhi was shot dead by her Sikh bodyguards. We speak to RK Dhawan, one of her closest aides, who was with her in the garden that morning and was a witness to her assassination.

(Photo: Indian school children light candles to pay tribute to the late former Indian Prime Minister Indira Gandhi. Credit: Narinder Nanu/AFP/Getty Images)

In 1998 Central America was hit by Hurricane Mitch. More than 18,000 people died, hundreds of thousands were left homeless. We hear from two people who were in Honduras, the country worst hit by the huge storm.

(Photo: One young man balances on a log to get across a river swollen by the storms in Honduras. Credit: Yuri Cortez/AFP/Getty Images)

In 1949, Iva Toguri, a Japanese-American woman, was wrongly convicted for making propaganda broadcasts on behalf of Japan during the Second World War. She was accused of being the infamous radio presenter known to American servicemen as "Tokyo Rose". Witness speaks to Ron Yates, a reporter whose investigation helped to clear Iva Toguri's name.

PHOTO: Iva Toguri in the 1940s (US National Archives)

19 October 1987 became known as Black Monday after share prices on Wall Street fell by a record rate.

We hear from Art Cashin, a trader at the New York Stock Exchange.

Photo: The scene on the floor of the New York Stock Exchange on Black Monday (MARIA R BASTONE/AFP/Getty Images)

In 1963, Erik de Mauny became the first BBC correspondent based in the Soviet Union.

The BBC had tried to open a bureau there during World War II, but only succeeded 20 years later.

De Mauny's son, Marc, talks about the hurdles his father had to overcome while reporting from behind the Iron Curtain.

Photo: Erik de Mauny (BBC)

In 1993, Burundi's civil war began. We hear the story of Marguerite Barankitse who helped thousands of children affected by the conflict and came to symbolise hope for peace. She is known as 'the Angel of Burundi'.

Photo: Marguerite Barankitse in Burundi / UNHCR

On 23 October 1983, hundreds were killed in co-ordinated suicide attacks on the headquarters of American and French troops stationed in Lebanon. The troops were part of a multi-national force deployed to help end the Lebanese civil war. Hear the story of Randy Gaddo, a US marine who witnessed the devastating attack on the US Marine barracks.

(Photo: Aftermath of attack on US Marine Barracks in Beirut, 23 October 1983. Credit: AP)

In 1991, one of East Berlin's most famous poets was revealed to have been an informer for the secret police. Sascha Anderson speaks to Witness about his double life.

Photo: A shelf in the files department of the Stasi-archives in Berlin. Credit: Johannes Eisele/AFP/Getty Images.