Days That Shaped America

Could one of the most tragic and shocking moments in NASA's history have been prevented? Go inside the heartbreaking loss of the Space Shuttle Challenger, from those who were there.

The siege of the Davidians' ranch in Waco, Texas, in 1993 became the deadliest event in ATF's history; hear stories from the people who monitored the 51-day siege until the ranch collapsed, with many Davidians left in the building.

Historic events that forever transformed the United States.

The Oklahoma City bombing on April 19, 1995, in which 168 people were killed, was the worst attack on U.S. soil until 9/11; the bomber was Timothy McVeigh, a Gulf War veteran.

On the anniversary of the 9/11 World Trade Center attacks, those who were caught in the middle of the disaster share their first-hand experiences of the day.