In May1984, three friends starting trekking along the Great Wall of China. It took 508 days for them to complete and they became the first people to do it.

They finally reached their destination at the Jiayu Pass on 24 September 1985, having documented the condition of the wall every step of the way.

The men became national heroes, as the press followed their progress. Dong Yaohui spoke to Rebecca Kesby in 2017 about the inspiration for their journey.

Eye-witness accounts brought to life by archive. Witness History is for those fascinated by and curious about the past. We take you to the events that have shaped our world through the eyes of the people who were there.

For nine minutes every day, we take you back in time and all over the world, to examine wars, coups, scientific discoveries, cultural moments and much more.

Recent episodes explore everything from how the Excel spreadsheet was developed, the creation of cartoon rabbit Miffy and how the sound barrier was broken.

We look at the lives of some of the most famous leaders, artists, scientists and personalities in history, including: the moment Reagan and Gorbachev met in Geneva, Haitian singer Emerante de Pradines’ life and Omar Sharif’s legendary movie entrance in Lawrence of Arabia.

You can learn all about fascinating and surprising stories, like the invention of a stent which has saved lives around the world; the birth of the G7; and the meeting of Maldives’ ministers underwater. We cover everything from World War Two and Cold War stories to Black History Month and our journeys into space.

(Photo: Dong Yaohui, Wu Deyu and Zhang Yuanhua. Credit: Dong Yaohui)

In 2013, after losing most of their cattle, a Maasai community in Kajiado County formed an organisation to protect their land and culture.

It's called ‘Ildalalekutuk Maasai Action for Development' and was formed by Dalmas Tiampati.

He tells Megan Jones how the aim was to help the community become more resilient and find ways to protect the culture.

Eye-witness accounts brought to life by archive. Witness History is for those fascinated by and curious about the past. We take you to the events that have shaped our world through the eyes of the people who were there.

For nine minutes every day, we take you back in time and all over the world, to examine wars, coups, scientific discoveries, cultural moments and much more.

Recent episodes explore everything from how the Excel spreadsheet was developed, the creation of cartoon rabbit Miffy and how the sound barrier was broken.

We look at the lives of some of the most famous leaders, artists, scientists and personalities in history, including: the moment Reagan and Gorbachev met in Geneva, Haitian singer Emerante de Pradines’ life and Omar Sharif’s legendary movie entrance in Lawrence of Arabia.

You can learn all about fascinating and surprising stories, like the invention of a stent which has saved lives around the world; the birth of the G7; and the meeting of Maldives’ ministers underwater. We cover everything from World War Two and Cold War stories to Black History Month and our journeys into space.

(Photo: Dalmas Tiampati. Credit: Maasai Action for Development)

In November 1986, Pope John Paul II visited New Zealand as part of his longest ever world tour.

He gave an open-air mass at Auckland Domain in front of thousands of people.

He remains the only Pope to have visited the country.

Jen Dale speaks to Michael Jarka who was in the crowd and performed as part of a Polish cultural dance group for the pontiff.

Eye-witness accounts brought to life by archive. Witness History is for those fascinated by and curious about the past. We take you to the events that have shaped our world through the eyes of the people who were there.

For nine minutes every day, we take you back in time and all over the world, to examine wars, coups, scientific discoveries, cultural moments and much more.

Recent episodes explore everything from how the Excel spreadsheet was developed, the creation of cartoon rabbit Miffy and how the sound barrier was broken.

We look at the lives of some of the most famous leaders, artists, scientists and personalities in history, including: the moment Reagan and Gorbachev met in Geneva, Haitian singer Emerante de Pradines’ life and Omar Sharif’s legendary movie entrance in Lawrence of Arabia.

You can learn all about fascinating and surprising stories, like the invention of a stent which has saved lives around the world; the birth of the G7; and the meeting of Maldives’ ministers underwater. We cover everything from World War Two and Cold War stories to Black History Month and our journeys into space.

(Photo: Pope John Paul II kisses the ground upon his arrival in Auckland airport. Credit: Jean-Claude Delmas/AFP via Getty Images )

When the Berlin Wall fell on 9 November 1989, it marked a turning point in the Cold War in Europe and set in motion the process that led to the reunification of East and West Germany. But before that could happen, Chancellor Helmut Kohl, had to address fears about the return of a powerful Germany and convince the four allied powers of France, Russia, the US and the UK - which had occupied Germany following the second world war - to agree to both countries reuniting. After some careful diplomacy and the intervention of the US President, the new Federal Republic of Germany was formed on 3 October 1990, ending 40 years of division. Joachim Bitterlich, a key advisor to Chancellor Kohl, speaks to Jacqueline Paine.

Eye-witness accounts brought to life by archive. Witness History is for those fascinated by and curious about the past. We take you to the events that have shaped our world through the eyes of the people who were there.

For nine minutes every day, we take you back in time and all over the world, to examine wars, coups, scientific discoveries, cultural moments and much more.

Recent episodes explore everything from how the Excel spreadsheet was developed, the creation of cartoon rabbit Miffy and how the sound barrier was broken.

We look at the lives of some of the most famous leaders, artists, scientists and personalities in history, including: the moment Reagan and Gorbachev met in Geneva, Haitian singer Emerante de Pradines’ life and Omar Sharif’s legendary movie entrance in Lawrence of Arabia.

You can learn all about fascinating and surprising stories, like the invention of a stent which has saved lives around the world; the birth of the G7; and the meeting of Maldives’ ministers underwater. We cover everything from World War Two and Cold War stories to Black History Month and our journeys into space.

(Photo: Celebrating German unification, Berlin. Credit: Owen Franken/Corbis via Getty Images)