Photographer: Sean Adair
- 2001-09-11 Two passenger planes hijacked by terrorists crash into New York's World Trade Towers causing the collapse of both and deaths of 2,752 people
- 2001-09-14 Historic National Prayer Service held at Washington National Cathedral for victims of the September 11 attacks. A similar service is held in Canada on Parliament Hill, the largest vigil ever held in the nation's capital.
- 2001-10-02 NATO backs US military strikes, following 9/11
- 2002-11-14 The United States House of Representatives votes not to create an independent commission to investigate the September 11 attacks
- 2004-04-08 U.S. National Security Advisor Condoleezza Rice testifies before the 9/11 Commission
- 2004-04-29 Dick Cheney and George W. Bush testify before the 9/11 Commission in a closed, unrecorded hearing in the Oval Office
- 2014-11-03 New York's 104-storey One World Trade Center officially opens 13 years after the September 11 attacks