The mystery of Raoul Wallenberg

On 21 August 1986 villagers in the north-west of Cameroon awoke to find that many of their friends and neighbours had died in their sleep. More than 1,700 people and much of their livestock are thought to have perished as a result of unexpected volcanic activity under Lake Nyos, which produced a cloud of deadly carbon dioxide. Tim Mansel spoke to two scientists who went to find out how it had happened. Photo: Dead livestock near Lake Nyos (Peter Turnley/Corbis/VCG via Getty Images)

29 Elo 20188min

The League of German Girls was the girl's wing of the Nazi party's youth movement, Hitler Youth. Open to girls aged ten years upwards, it was a key part of the Nazi plans to shape a new generation of Germans. Caroline Wyatt travels to Berlin to meet Eva Sternheim-Peters, now 93, who joined the League at the age of ten and rose to be one of its leaders. Photo: Eva Sternheim-Peters at home in Berlin (Credit: Stefan Thissen)

28 Elo 20188min

The Spanish town of Benidorm is now one of the world's most popular holiday resorts - receiving more than 10 million visitors a year. The hotels and skyscrapers are the vision of Benidorm's mayor in the 1950s and 60s, Pedro Zaragoza. Zaragoza personally convinced Spain's dictator, General Franco, to allow more tourism - and to allow sunbathers to wear the bikini. Simon Watts introduces the memories of Pedro Zaragoza, as recorded by Radio Elche Cadena Ser shortly before his death.PHOTO: A busy day at Benidorm (Reuters)

27 Elo 20188min

Among the leading Nazi inmates in Berlin’s Spandau prison, which was closed in August 1987, was Hitler's architect and minister of war, Albert Speer. He was the only top Nazi who later apologised for the Holocaust, although he claimed he never knew it was happening. Louise Hidalgo has been speaking to the journalist Roger George Clark, who interviewed Speer a decade after his release at his home in West Germany. Picture: Albert Speer standing at the gate of his house near Heidelberg in December 1979. (Credit: Roger George Clark)

24 Elo 201810min

The story behind the groundbreaking autobiography of a woman who grew up in 19th century pre-colonial Nigeria. The book is the story of Baba a Hausa woman, who lived in the farming hamlet of Karo, when the region was part of the Islamic empire, the Sokoto Caliphate. Baba's account was written down by an English woman, Mary Smith, in 1949, while she was working in northern Nigeria with her husband, the anthropologist, M.G Smith. The book became a key text in studies of pre-colonial Africa. Alex Last has been speaking to Mary Smith about her memories of Baba.Photo: Baba as an old woman in northern Nigeria in 1949 (credit: Mary Smith)

23 Elo 201810min

Sales of alcohol in the USSR were severely limited in 1985 in a bid to fight drunkenness. But the anti-alcohol campaign was abandoned three years later when the Soviet economy was in trouble, and the government need more taxes. Dina Newman discussed the reasons for the campaign's failure with the former advisor to the Central Committee of the Communist Party, Alexander Tsipko. Photo: A Soviet anti-alcohol poster; Credit: Fine Art Images/Heritage Images/Getty Images.

22 Elo 20188min

A former student, Olda Cerny, tells Alan Johnston about how he made a desperate appeal for the support of the outside world as invading Soviet tanks rumbled through the streets of the Czechoslovak capital in August 1968. This programme was first broadcast in 2010.Picture: Soviet troops in Prague (Getty Images)

21 Elo 20188min

An intriguing story from West Germany in August 1988, of a bank robbery, a three-day car chase that had the country holding its breath, and a journalist who got a little bit too close to the story. Tim Mansel has been hearing from one of the people at the centre of this crisis, journalist Udo Roebel.Photo: Holding a weapon in his hand, kidnapper Hans-Jürgen Rösner calls on journalists and spectators to free the way in the city of Cologne, August 1988 (Press Association)

20 Elo 20188min