As Darcey Bussell takes her final curtain call, she reflects on nearly 20 years as principal dancer of the Royal Ballet in London. Bussell talks to Louise Minchin and explains why she is retiring at the peak of her powers

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The destruction of the twin towers was a site that became the definition of terror. It was an onslaught that killed nearly three thousand people - but a decade later, the attack isn't over. The dust that overwhelmed the streets of Lower Manhattan became a weapon. The clouds contained particles of pulverized concrete, asbestos, lead from fifty thousand computers, mercury from countless light bulbs -- a million tons of poisonous fallout. Now nearly 20,000 people are receiving treatment for a range of illnesses, many of them serious. And more than 60,000 are registered as at risk. The BBC Our World team first broke the story globally in 2006. They return 5 years later to investigate a worsening tragedy and followup with those who shared their stories.

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As a wave of protests and self-immolations continues against the rule of China on the Tibetan plateau, Sue Lloyd-Roberts asks the Dalai Lama if the dream of increased independence for Tibet is dead.

As part of the Big Stories 2014, this is the untold story of the hidden victims of the war in Afghanistan: the women whose husbands were killed in the fight against the Taliban.

The northern French port of Calais is facing an international refugee crisis. Darius Bazargan has been to Calais to meet the migrants, and the locals, caught up in a growing humanitarian crisis.

It's the first planned Palestinian city, a billion dollar project to build homes for 25,000 people. Though the main building work is largely finished the project, like the peace process, has ground to a halt over disagreements between the Palestinians and the Israelis.

Eritrea has been described as one of the most secretive states in the world. For the first time in around 10 years, BBC News has been been allowed to to film inside the country.

Our World speaks to former US prisoners released under a new presidential clemency initiative which is part of a changing approach to tackling drug offences in the United States.

Mark Urban returns to Bosnia for 'Our World' and discovers how secular Bosnian society has been infiltrated by a militant Islamism which operates to this day.

Over the past ten years, thousands of unaccompanied children have fled to the UK from war-torn Afghanistan, but when they turn 18 they have to return or face deportation. Chris Rogers follows some of the young men, who claim their deportation to Afghanistan would be inhumane and that the UK is now their home.

In 2015, Iran agreed a long-term deal on its nuclear program with a group of world powers known as the P5+1 - the US, UK, France, China, Russia and Germany. Our World reports on the process that led to the agreement.

More Americans die from drug doses than car crashes or gun fatalities. The majority of the deaths involve the use of heroin or prescription painkillers. Over the past year, Ian Pannell has followed a number of addicts as they try to kick the habit.

Gabriel Gatehouse reports from Louisiana. How much of a difference did Barack Obama's presidency make to the lives of African-Americans?

Our World investigates allegations of mass murder and rape among Myanmar's displaced Rohingya minority. Asking why Burmese leader and democracy icon Aung San Suu Kyi has failed to stop what the UN is calling crimes against humanity.

A brilliant student, Mashal Khan, was brutally murdered by a mob on a university campus in Pakistan earlier in 2017 after he was accused of blasphemy. The killing caused widespread outrage in Pakistan and has even led to calls to change the country's strict blasphemy laws. Who was Mashal Khan and why was he murdered? Secunder Kermani investigates.

In Ukraine more than 30 thousand children with disabilities are living in state run institutions. A few are orphans but most have families, yet spend much of their lives in children's homes, some in shockingly bad conditions. The Government of Ukraine has vowed to end this practice, with the most radical reforms the country has seen since it gained its independence from the Soviet Union 26 years ago. Nikki Fox, the BBC's disability news correspondent, has this exclusive report.

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For centuries, a significant Sikh minority has grown in relative safety in Afghanistan. But, in the last decade, persecution has seen the population drop.

In northern Europe's Lapland, temperatures are rising faster than anywhere else in the world, threatening the livelihood of its indigenous Sami people. Central to Sami life is the ancient practice of reindeer herding, but climate change is putting the reindeer at risk of starvation. Many Sami also worry that plans to build a railway, to exploit Lapland's natural resources, will add to the pressure on their traditional way of life. For Our World, Erika Benke has been to Arctic Finland to hear from Sami women about their fears for the future.

Google, Apple and Facebook-owned Instagram are enabling an illegal online slave market by approving and providing apps used for selling domestic workers in the Gulf. For Our World, BBC News Arabic’s undercover investigation exposes the people in Kuwait breaking local and international laws on modern slavery, including a woman offering a child for sale. At the centre of this powerful investigative film is Fatou a 16 year old in Kuwait City who has been there for nine months. We follow her rescue and journey back home to Guinea, West Africa and ask what’s being done to control these apps?