This month marks 20 years since the 9/11 terrorist attacks. Most of us will be able to remember where we were when we first heard about it or saw the chilling footage on the news.

The events of that day have shaped the modern world and impacted our lives in countless ways.

On the morning of 11 September 2001, 19 Al-Qaeda terrorists hijacked four commercial passenger planes in the United States.

Two planes were flown into the Twin Towers of the World Trade Center in New York City, causing both towers to collapse. A third plane was crashed into the Pentagon, just outside Washington, DC.

The fourth plane crashed in rural Pennsylvania after the crew and passengers attacked the terrorists on board, preventing it from hitting another target thought to be the White House.

The attacks killed almost 3,000 people, but would impact many more globally in the years to come.

Less than two weeks after the attacks, US President George W Bush declared a 'War on Terror'. He stated that defeating terrorism was now the world’s fight.

On 7 October 2001, an international coalition led by the USA invaded Afghanistan to destroy terrorist organisation Al-Qaeda when the Taliban refused to hand over Osama bin Laden. British forces went in alongside US troops.

After 20 years of conflict, the Taliban again claim to be in control of Afghanistan.

IWM will be marking 20 years since the 9/11 terror attacks and exploring their global legacy in 9/11 Twenty Years On, a programme including the display of large scale photographs at IWM London. Click here to find out more.

Objects that tell the story of 9/11 and the events that followed are on display at IWM London, IWM North and IWM Duxford.

See artwork by filmmaker Steve McQueen at IWM London, the War on Terror Boardgame at IWM North, and a Tornado GR4 aircraft at IWM Duxford, plus steel work from the World Trade Center at all three sites.

Deepen your understanding of the legacy of 9/11 with a visit to one of our branches.

Click here to see what's on display at each branch ahead of your next visit.