Sunday marked the 15th anniversary of the September 11 terror attacks that claimed nearly 3,000 lives and forever changed Americans' feelings of safety at home.
Here are nine images of the tributes and ceremonies that sought to remember the victims of the unspeakable tragedy.
A ceremony at Ground Zero was held in commemoration of the 15th anniversary of the terrorist attacks on the World Trade Center, the Pentagon, and the crash of United Airlines Flight 93 in Shanksville, Pennsylvania, in lower Manhattan, New York City, New York, USA on September 11, 2016. (Albin Lohr-Jones/Sipa via AP Images)
People gather at one of the pools at the National September 11 Memorial following a morning commemoration ceremony for the victims of the terrorist attacks 15 years after the day on September 11, 2016, in New York City. (Spencer Platt/Getty Images)
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EMS worker Joseph Sunshine clutches a framed picture of colleagues who died in the attack near the National September 11 Memorial and Museum on the 15th anniversary of the 9/11 attacks in Manhattan, New York, U.S., September 11, 2016. (Andrew Kell/Reuters)
The Tribute in Light shines on the 15th anniversary of the 9/11 attacks in Manhattan, New York, U.S., September 11, 2016. (Andrew Kelly/Reuters)
A large American flag is displayed on the filed in remembrance of 9/11 during the national anthem before a game between the New Orleans Saints and the Oakland Raiders at the Mercedes-Benz Superdome. (Derick E. Hingle-USA TODAY Sports)
President Barack Obama listens as Secretary of Defense Ash Carter speaks during a memorial ceremony to commemorate the 15th anniversary of the 9/11 terrorist attacks, Sunday, Sept. 11, 2016, at the Pentagon in Washington. (AP Photo/Manuel Balce Ceneta)
New York City Mayor Bill de Blasio speaks to U.S. Democratic presidential nominee Hillary Clinton during a memorial service at the National 9/11 Memorial September 11, 2016 in New York. The United States on Sunday commemorated the 15th anniversary of the 9/11 attacks. (Brendan Smialowski/AFP/Getty Images)
New York City Mayor Bill de Blasio (L) and Republican presidential nominee Donald Trump speak during the 15th Anniversary of September 11 at the 9/11 Memorial and Museum, Sunday, September 11, 2016 in New York. (Bryan R. Smith/AFP/Getty Images)
U.S. Republican presidential candidate Donald Trump and New Jersey Governor Chris Christie attend ceremonies to mark the 15th anniversary of the September 11 attacks at the National 9-11 Memorial in New York, United States September 11, 2016. (Brian Snyder/Reuters)
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