The morning of September 11, 2001 changed the world. Twenty years later, questions still linger about the worst terrorist attack in U.S. history. In this six-part crossover special, we’re taking a look back at what we do and don’t know about the tragedy that unfolded, starting with a moment-by-moment account of the attacks. 

For more episodes like this one, follow Conspiracy Theories and Unexplained Mysteries, Spotify Originals from Parcast. 

Learn more about your ad choices. Visit podcastchoices.com/adchoices