Interviews and chilling archival recordings chronicle the chaos that unfolded during the 9/11, whose origins can be traced to the 1980's.

Survivors recount the horrors they endured on 9/11. Immediately after the attacks, George W. Bush begins charting America's aggressive military response.

Learning the hijackers benefited from the gaps in US intelligence, the White House justifies a secret surveillance program and "enhanced interrogation".

With no cohesive strategy, the war in Afghanistan squanders early successes and backfires, fueling disillusionment, corruption and a Taliban resurgence.

After two decades, the US aims to end its longest ever war, but its withdrawal threatens to plunge Afghanistan back into repressive, bloody violence.