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

Two steel columns, from the North Tower, known as tridents. They are the first artifact that visitors encounter as they make their descent into the 9/11 Memorial Museum and the only one visible from the 9/11 Memorial. www.911memorial.org/visit | National September 11 Memorial & Museum

1.1K views · 40 reactions | #OnThisDay in 2001, President Bush's Oval Office Address. "Terrorist attacks can shake the foundations of our biggest buildings, but they cannot touch the foundation of America." #September11. | American History TV | Facebook

9/11 Anniversary: Behind the 19 Hijackers