In 1932, a photo was taken showing 11 New York ironworkers casually eating their lunch while sitting on a steel beam at the top of a skyscraper. No safety harnesses, no helmets. Their legs dangle freely over the death-defying drop.

'Lunch Atop a Skyscraper' is now one of the most famous pictures in the world but it's an image surrounded in mystery. For years, the identity of its photographer and the 11 men have been unknown.

Christine Roussel, archivist at the Rockefeller Center, tells Vicky Farncombe about her mission to uncover the photo’s secrets.

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. For nine minutes every day, we take you back in time and all over the world, to examine wars, coups, scientific discoveries, cultural moments and much more.

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(Photo: Lunch Atop a Skyscraper. Credit: Getty Images)