These works help ensure the world never forgets what happened.

n the two decades since the 9/11 terrorist attacks, films have reflected on that tragic day, honored the victims and recognized the heroes who risked their lives to save others.

While the footage is heartbreaking and difficult to watch, documentaries and movies help ensure the world never forgets what happened on Sept. 11, 2001. “History has to be remembered, the good part and the bad part,” says Jules Naudet, one of the filmmakers behind the “9/11’ documentary, who captured video inside the World Trade Center that fateful day.

should not shy away from them as time goes by.”

Here are some of the most notable films about Sept. 11:

“Zero Dark Thirty”

Led by Jessica Chastain, “Zero Dark Thirty” provides a dramatized account of the tireless pursuit of Osama Bin Laden.

The 2012 film arrived less than two years after Bin Laden’s death, depicting the raid in which U.S. Navy SEALS killed the al-qaida leader.

“Zero Dark Thirty” was a hit with critics and earned five Oscar nominations, including for best picture.

How to Watch: Stream on STARZ or Directv

“United 93’

Another critically acclaimed feature film, “United 93’ focuses on one of the four flights hijacked by terrorists on 9/11.

United Airlines Flight 93 crashed into a field in Somerset County, Pennsylvania, following a struggle between the heroic passengers and the hijackers that prevented the terrorists from hitting their target, which many believe was the White House or Capitol building.

Paul Greengrass earned a best director nomination at the Oscars for the 2006 movie.

How to Watch: Stream on Peacock or Fubo

“12 Strong”

The 2018 war drama tells the true, little-known story of a small U.S. Special Forces team that navigated Afghanistan on horseback after 9/11 to team up with allies in the fight against the Taliban.

Chris Hemsworth stars as the leader of that 12-man unit, playing a character based on real-life Green Beret Mark Nutsch.

“Even just as a thank you to them, I wanted to be a part of this story,” Hemsworth told the Daily News in 2018. “I wanted to be a part of the acknowledgment and appreciation for what they’d done.”

The film is produced by Jerry Bruckheimer, who told The News at the time, “This was a response to 9/11, so I think this is something that audiences want to see. It’s kind of payback for what happened in a small way.” How to Watch: Available to rent or buy on most digital platforms

“Extremely Loud & Incredibly Close”

The drama film puts a face to the 9/11 tragedy by depicting a young boy who lost his father in the World Trade Center attacks.

Tom Hanks, Sandra Bullock, Thomas Horn, Viola Davis and Max Von Sydow star in the 2011 movie, which earned a Best Picture nomination at the Oscars. Von Sydow was also nominated for Best Supporting Actor. How to Watch: Available to rent or buy on most digital platforms

“Fahrenheit 9/11’

The controversial documentary by liberal filmmaker Michael Moore delves into the presidency of George W. Bush, 9/11 and the subsequent war on terror with a highly critical eye.

The 2004 film proved to be polarizing, with supporters of the 43rd president refuting much of Moore’s project. Critics, however, weren’t as split in their positive reception, and “Fahrenheit 9/11’ won the top prize at the Cannes Film Festival.

By earning nearly $120 million in North American theaters, “Fahrenheit 9/11’ is far and away the highest-grossing documentary of all time. How to Watch: Available to

rent or buy on most digital platforms, or stream on Tubi

“NYC Epicenters 9/11-2021 1/2’

The 9/11 terrorist attacks are a focal point of Spike Lee’s new documentary series, which covers New York City and tragedies that occurred there.

The four-part HBO project debuted its third episode Sunday, before the finale airs today. Lee recently reedited the final episode, removing conspiracy theory content that was previously debunked.

How to Watch: HBO

“Worth”

The newly released film

centers on the true story of the September 11th Victim Compensation Fund, and the tough decisions that came with trying to provide resources to those who lost loved ones.

Michael Keaton leads the “Worth” cast, which also includes Stanley Tucci and “The Office” actress Amy Ryan.

How to Watch: Netflix

CNN coverage

On Sunday, CNN will broadcast Jake Tapper’s two-hour special, “America’s Longest War: What Went Wrong in Afghanistan,” which begins at 9 p.m. ET. How to Watch: CNN, with rebroadcasts also scheduled

BRIAN CASSELLA/CHICAGO TRIBUNE/TNS The September 11 Memorial North Pool and One World Trade Center at night on Oct. 8, 2014, in New York.

MONIKA LEK/NETFLIX/TNS Michael Keaton and Stanley Tucci in “Worth,” the story of how the 9/11 Victims’ Compensation Fund was established.

COLUMBIA PICTURES This publicity photo shows Jessica Chastain, as Maya, a member of an elite, covert team in the thriller, “Zero Dark Thirty.”

COURTESY OF HBO “NYC Epicenters 9/11-2021 1/2” is a four-part HBO project directed by Spike Lee that focuses on New York City and the tragedies that have occurred there since the Sept. 11, 2001, attacks.