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

12K views · 410 reactions | The antenna that sat atop the North Tower...

10K views · 134 reactions | It's been 20 years since the Pentagon was attacked on 9/11. We are now in the process of creating a 9/11 Pentagon Memorial Visitor Education Center to educate current and future generations. Donate now to support our efforts. We must never forget, always remember. | Pentagon Memorial Fund, Inc. | Facebook