As a photographer, I have always aspired to create photographs that have never been seen before: unique and spontaneous moments. But capturing certain photographs have become almost a rite of passage for any travelling photographer – even if they have been photographed thousands of times. This one is mine.

September 11, 2001, was meant to be just another day in the office for Milton G. Bustillo as he made his way to his office on the 103rd floor of World Trade Center's North Tower. And then the planes hit, and the world changed forever.