9.5K views · 442 reactions | 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 | Facebook

In 2004, a large earthquake in the Indian Ocean triggered the largest tsunami in recorded history. One of the countries hit by the tsunami was Sri Lanka, where the wave caused one of the worst train disasters in human history when it hit the Queen of the Sea passenger line, which was carrying 1,500 passengers along Sri Lanka's west coast. Watch Destruction Decoded on Wednesdays at 8pm on National Geographic UK. | National Geographic UK

7.9K views · 29 reactions | After 9/11, a community emerged from shared experiences. Connecting with others helped fill a void. A simple coffee led to uniting forces and forming a network of survivors. Finding strength together. #NeverForget #911Memorial #SurvivorsNetwork #CommunitySupport #SharedExperience #WorldTradeCenter | Real Stories | Facebook

35K views · 360 reactions | Not only did Sandler O'Neill lose more than one third of its employees on 9/11, but it also lost its entire World Trade Center headquarters. Steve Kroft was there as the financial firm returned to business. As we approach the 20th anniversary of September 11th, we will republish some of the most memorable stories that aired on our broadcast in the weeks and months after the attacks. https://cbsn.ws/3h7dWGN | 60 Minutes | Facebook