"If at any point in my life what I did mattered, it was now." Created in collaboration with National September 11 Memorial & Museum , the four-night limited series #911OneDayInAmerica continues TONIGHT at 9/8c. Catch up now on Hulu | National Geographic TV

291K views · 7.6K reactions | Starting 31st August at 9pm, 9/11: One Day in America marks 20 years since the tragic events of September 11th 2001. This groundbreaking documentary series tells the definitive story of the day through the experiences of those who were there. | National Geographic UK | Facebook

Starting 31st August at 9pm, 9/11: One Day in America marks 20 years since the tragic events of September 11th 2001. This groundbreaking documentary series tells the definitive story of the day through the experiences of those who were there. | National Geographic UK

137K views · 2.1K reactions | Don’t miss 9/11: One Day in America. Available to catch up on demand now, this groundbreaking documentary series tells the definitive story of the tragic events of 11th September 2001 through the experiences of those who were there. Watch on Sky, NOW, Virgin, BT, TalkTalk and TV Player. | National Geographic UK | Facebook

1.6K reactions · 270 shares | 9/11: One Day in America tells the in-depth story of September 11th through the eyes of the witnesses, heroes and survivors. Made in collaboration with the 9/11 Memorial & Museum to mark the 20th anniversary. 9/11: One Day in America is on National Geographic from 6 September to 11 September, every night at 7.30pm AEST. | National Geographic Australia | Facebook

3.5K views · 54 reactions | In remembrance of the attacks on September 11th in New York City, Washington D.C. and Pennsylvania 20 years ago this year, 9/11: One Day in America follows the events of that tragic day, minute by minute, as seen through the eyes of first responders and survivors who were there. 9/11: One Day in America premieres on Tuesday 31st August at 9pm on National Geographic UK. | National Geographic UK | Facebook

41K views · 1K reactions | Told through powerful first-hand accounts, #911OneDayinAmerica honors the heroic actions of first responders and survivors. Created in collaboration with the National September 11 Memorial & Museum, the four-night limited series premieres tomorrow at 9/8c and next day on Hulu | National Geographic Documentary Films | Facebook