In 1972, after leaving The Beatles, John Lennon and Yoko Ono performed in the United States at the One to One benefit concerts at Madison Square Garden, New York.

They were helping to raise money for children with disabilities from Willowbrook State School, after a television exposé by journalist Geraldo Rivera showed the conditions and failings. It was watched by millions of people and led to a public outcry.

Sean Allsop speaks with Geraldo Rivera about breaking the story and organising the concerts.

A TBone production.

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

(Photo: John Lennon performing at the One To One events. Credit: Ann Limongello/ABC)

In 1948, filming began on a post-war thriller that would become one of the greatest British movies of all time.

Directed by Sir Carol Reed, the film captured the atmosphere of a divided, ruined Vienna.

But much of its lasting power lies with Orson Welles, whose magnetic, menacing turn as Harry Lime stole the show - despite his limited screen time and reputation for being famously hard to pin down.

Phil Jones speaks to production assistant Angela Allen about the film that became legend.

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

(Photo: Harry Lime, played by Orson Welles. Credit: Getty Images)

In May 1991, a female police officer shot and wounded a young immigrant from El Salvador in the Mount Pleasant neighbourhood in Washington DC in the United States.

It sparked several days of disturbances in the largely Hispanic area, as the population vented its frustrations at years of feeling sidelined by city officials.

Shops were burnt down, cars overturned, and dozens of people were arrested before the police took back control of the streets. But for the first time, it gave visibility to a community that had been largely ignored.

Mike Lanchin hears from musician and former resident of Mount Pleasant, Victor ‘Lilo’ Gonzalez.

A CTVC production.

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

(Photo: Marchers fill the streets in Mount Pleasant in Washington DC in 1991. Credit: Reuters)

In 2000, as the internet expanded, websites faced a growing challenge to stop spam bots from flooding their systems.

To separate humans from machines, researchers at the United States’ Carnegie Mellon University in Pittsburgh, Pennsylvania, created the Completely Automated Public Turing test.

From its early development to its evolution into reCAPTCHA it continues to block millions of automated attacks every day.

Ashley Byrne speaks to computer scientist Andrei Broder, who played a key role in developing the concepts that helped shape this technology.

A Made in Manchester production.

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

(Photo: I am not a robot. Credit: Stock image / Vector Illustration)

In 1998, at a conference organised by the United Nations, a blueprint was devised for what would be the world's first permanent International Criminal Court.

Judge Phillipe Kirsch chaired the Rome conference that led to the formation of the court. He tells Gill Kearsley about the negotiations, which he describes as the most difficult professional thing he ever did.

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

(Photo: International Criminal Court. Credit: Nicolas Economou/NurPhoto via Getty Images)

In 1859, Swiss businessman Henry Dunant witnessed the Battle of Solferino, in Italy.

He couldn’t believe the lack of aid for the wounded soldiers and came up with two ideas – a voluntary aid organisation and an international treaty to protect those injured in wartime.

They went on to become the International Committee of the Red Cross in 1863 and the first Geneva Convention in 1864.

Henry’s great great great grand nephew, Gabriel Martinez, read excerpts from his book, A Memory of Solferino, to Rachel Naylor.

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

(Photo: Participants representing 16 states during the adoption of the first Geneva Convention on 22 August 1864 in Geneva. Credit: AFP via Getty Images)

In the early 2000s, BlackBerry was the phone that ruled the world. But within a decade, it collapsed, overtaken by the touch screen revolution.

Sam Gruet speaks to former co-CEO Jim Balsillie about BlackBerry’s meteoric rise, its battle against Apple, and the moment he knew it was all over.

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

(Photo: BlackBerry phone in 2002. Credit: Rob Homer/Fairfax Media via Getty Images)

In 2010, a book came out in Norway that transformed the way people looked at paperless immigrants. The author, a 25-year-old Russian woman, fled North Ossetia as a child with her parents. They were never granted asylum, yet she managed to earn a university degree and eventually had to make a choice: continue living in hiding or face deportation.

Her book triggered a government crisis and a change to Norway's immigration regulations. Lars Bevanger speaks to the author, Maria Amelie.

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

(Photo: Maria Amelie. Credit: BBC)

In 1951, at the height of the McCarthy era, a time when the US government pursued suspected communists, Victor Grossman was drafted into the army. A committed communist since his teens, he hid his political beliefs.

Stationed in West Germany and under FBI scrutiny, he faced the threat of a possible court martial. To avoid prison, he fled to the Soviet Union in 1952, swimming across the Danube River.

Victor tells Lizzy Kinch about his dramatic escape and life in East Germany. A Whistledown production.

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

(Photo: Victor Grossman. Credit: Victor Grossman)

In 1978, British artist Eric Hill designed an interactive book about a yellow puppy for his two-year-old son, Chris.

Eric had noticed Chris kept lifting up the paper he was working on to see what was underneath and it inspired him to come up with a new format for a children’s book - lift-the-flap.

Since Where’s Spot? was published in 1980, more than 65 million copies of Spot books have been sold worldwide, in more than 60 languages.

Rachel Naylor speaks to Eric’s son, Chris Hill.

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

(Photo: Eric Hill with Spot in 1984. Credit: Ted Bath / Daily Express / Hulton Archive / Getty Images)