Ceremonies were held Friday in New York City, Virginia and Pennsylvania.
Friday marks 25 years since the Sept. 11, 2001, terror attacks, which claimed the lives of 2,977 people at the World Trade Center, the Pentagon and Shanksville, Pennsylvania.
Another 9,000 people have died from 9/11-related illnesses over the last 25 years.
Victims' families, first responders and politicians gathered for annual remembrance ceremonies at the memorials in downtown Manhattan, the Pentagon in Virginia, and Shanksville, as Americans across the country pause to remember and reflect.
"9/11 Tribute in Light: Live from Lower Manhattan," a one-hour ABC News multiplatform live special, premieres on Friday, Sept. 11, at 8:00 p.m. EDT across ABC, Disney+, Hulu, National Geographic, ABC Owned Television Stations livestreams and ABC News Live.
“Good Morning America” co-anchor George Stephanopoulos shared a video from the moment he and other journalists were evacuated while covering the collapse of the World Trade Center.
Former President George W. Bush posted his artwork of several famous images from 9/11 on his Instagram page Friday.
The paintings include a recreation of the image when Bush was told about the attacks during a visit to a school, and the unfurling of the U.S. flag outside the Pentagon on Sept. 12, 2001.
"Twenty-five years ago, the actions of an enemy revealed the spirit of the American people. These and other paintings are my reflections of this solemn anniversary and will be on display all month at [The George W. Bush Presidential Center]," he said in his post.
Bush reflected on the anniversary during a conversation with former Secretary of State Condoleezza Rice Wednesday.
"9/11 was a clarifying moment for me and you and others in our administration because they realized that we were vulnerable to attack based upon what we believe," he said.
A new art installation at the 9/11 Memorial & Museum comes from the hearts and minds of children who lost a parent or sibling on 9/11.
The installation, a papier-mâché sculpture titled "The Feathers of the Phoenix," is composed entirely of artwork from the children at America's Camp, a free, weeklong camp that hosted the children of 9/11 victims every summer in the Berkshires for 10 years, closing as planned in 2011 on the tragedy's 10th anniversary.
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The reading of the names at the New York City ceremony concluded with powerful words from the son of victim Michael Massaroli.
“You do my dad’s legacy and the legacy of all these victims no honor by using this tragedy to spread hate,” he said.
“We have seen a medley of people come up today [to read victims’ names], of all races, all religions, all creeds,” he said.
“I’ve had to grow up and spend the past 25 years seeing people use [9/11] to hate on our Muslim brothers and sisters, to hate on people who don’t look like them. And that’s wrong and that does no honor to the victims here,” he said, as the crowd applauded. “I want to use the little platform I have to ask for that to please stop.”
He also thanked the dignitaries and families who stayed until the end of the reading of the names, saying every single name matters.
