9/11 image of a man falling to his death from the North Tower continues to haunt the world 20 years after the tragedy. Captured mid-air as he plunged thousands of feet, the person became known as The Falling Man.
However, 20 years on from the terror attack, he has never been identified. Our sister title The Mirror report how the picture - although millions still refuse to view it - will always remain one of the defining images of the 21st century.
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