In 1996, the bricklayer renovating Merced dos Anjos’ home in Rio de Janeiro told her something strange had happened. Bones appeared as he was breaking ground. As she inspected the site, she found they were human. But why so many bones? Was it the work of a serial killer?

The answer was more macabre. They had unearthed an ancient cemetery. The discovery shed light on the brutal history of Brazil’s slavery past – and Rio’s role as the biggest slavery port in the Americas.

The neighbouring Valongo Wharf, today a World Heritage Site, received roughly one million African captives by 1831. Many were too weak after the transatlantic crossing and died soon after arriving. They were buried in the so-called New Blacks Cemetery.

Merced dos Anjos tells Julia Carneiro how the discovery upended her life and led her to create a research centre to shed light on Rio's painful past.

An Overcoat Media production.

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: Merced Guimarães dos Anjos. Credit: Julia Dias Carneiro)

Canada’s Truth and Reconciliation Commission was a seven-year project which examined the country’s residential school system.

For more than 100 years, Indigenous children were taken from their families to boarding schools with the sole purpose to “kill the Indian in the child”.

The schools were run by various church organisations on behalf of the Canadian government, and many children were subject to physical and sexual abuse.

In 2015, the commission found that cultural genocide had been committed against Canada’s Indigenous people.

Chief Wilton Littlechild was one of the three commissioners who travelled the country hearing survivor’s testimony. He has been speaking to Tim O’Callaghan.

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: Female students at a residential school with a nun in 1940. Credit: Reuters/ Canada. Dept. Indian and Northern Affairs/Library and Archives Canada)

In 1954, the BBC broadcast a new television programme in the United Kingdom.

It was called Zoo Quest and it launched the career of a man who has since brought the natural world into millions of homes around the world, the broadcaster Sir David Attenborough.

In 2021, Louise Hidalgo dove into the BBC archives to hear Sir David tell the story of the first natural history expedition for Zoo Quest - the hunt for the White-necked Picathartes in Sierra Leone in West Africa.

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: Sir David Attenborough plays recordings to Bundu Tribeswomen for Zoo Quest. Credit: BBC)