Every defense mechanism the U.S. government had on 9/11 failed except for one: the passengers and crew aboard United Airlines Flight 93. They were on the final plane to be hijacked that day and heard reports of the attacks from loved ones on the ground. Then they rallied to stop the terrorist plot.

But where was the plane headed before it crashed? What was the intended target of the Flight 93 hijackers?

After both towers of the World Trade Center were hit on September 11, 2001, first responders coordinated the largest emergency response in New York City’s history. But their heroism at Ground Zero was hampered by institutional bureaucracy and ultimately undone by decisions made decades earlier, when the Twin Towers were built.

So why did these iconic structures and architectural marvels fall so fast? Could more people have been rescued from the towers? And could some of those deaths have been avoided? 

Many of us watched the terrorist attacks on September 11th, 2001 unfold right before our eyes. In the years since, law enforcement, congressional inquiries and the press have successfully uncovered more about what happened that day. But now on the 20th Anniversary of the attacks, many mysteries remain. Hosted by bestselling author and reporter Garrett Graff, Long Shadow answers those lingering questions and explores other enduring mysteries that still surround 9/11, the worst terrorist attack on U.S. soil. Premiering this August, produced by Long Lead and Goat Rodeo.