The skyscraper is scheduled to be complete in 2031 and rise 1,226 feet.
Approximately 40% of those who died -- 1,104 people -- remain unidentified.
Firsthand accounts from those who were in lower Manhattan on that fateful day, with commentary from then-anchor Bill Beutel. (Warning: This contains images that some may find disturbing.)
The stories appear as they aired 22 years ago when terrorists crashed hijacked planes into the World Trade Center.
The document is a summary of a 2015 FBI interview with a suspected Saudi Intelligence Agent who was living in California.
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.