Thick plumes of black smoke billowed into the sky from the roof of a building in New York.
The families of the World Trade Center victims returned to Lower Manhattan for the remembrance ceremony to read the names of the lives lost on September 11, 2001.
Stephen Siller's family didn't want to stay in a dark place after he died a hero on 9/11, so they turned their focus into doing good in his memory and all the others who perished that day.
A NatGeo exhibit by Henry Leutwyler features rare and never before seen objects from the attacks of September 11.
Two decades later, these women share their experiences of that day and how they rose to leadership positions in the years that followed.
Phil Alvarez is committed to honoring the work of his late brother, Luis, who died from health complications relating to his time in Lower Manhattan following the attacks.
