Learn the facts and numbers behind the construction of One World Trade Center in Lower Manhattan.

FACT CHECK: We strive for accuracy and fairness. But if you see something that doesn't look right, contact us!

RELATED CONTENT

Out of the rubble of the World Trade Center rose a symbol of hope for many in the days after 9/11. Part of the Emmy Award winning web series, Remembering 9/11.

Construction is underway at the 16-acre World Trade Center site.

Daniel Libeskind on Rebuilding Ground Zero.

This video clip provided to "History Uncut" was taken immediately after the planes struck the two World Trade Center towers. We glimpse into the harrowing images of Manhattan that are not often shown in news broadcasts: a cameraman's frantic shadow fleeing the scene of disaster, emergency vehicles rendered unrecognizable by debris, and members of the NYPD who attempt to make sense out of the destruction.

A timeline of the events on September 11, 2001.

What happened to the flag hoisted at Ground Zero on September 11, 2001?