The 9/11 Memorial & Museum faced a daunting challenge: how do you tell the story of the September 11 terrorist attacks at the World Trade Center without making it unbearable? How do you memorialize a day most of us wish we could forget? In 2013, Lesley Stahl visited the museum at Ground Zero, a year before it opened and explored its most challenging debates. Today marks 24 years since the September 11 terrorist attacks. | 60 Minutes

Descending from the 9/11 Memorial into the 9/11 Memorial Museum, visitors encounter 110,000 sq. ft. of museum space and historic artifacts set within the remnants of the Twin Towers. www.911memorial.org | National September 11 Memorial & Museum

82K views · 1.1K reactions | The passengers aboard United Flight 93 fought back against the plane’s hijackers before it crashed in Shanksville, Pennsylvania, on 9/11. ABC News' JuJu Chang speaks with family members of one of the heroes on that flight. abcn.ws/2VzPGFW | ABC News Live | Facebook