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

416K views · 223 reactions | On this day in 2001, a series of terror attacks devastated the United States. It was a morning that will never be forgotten. | KOAT | Facebook

9/11 Survivors, 10 Years Later