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September 11, 2026, marks the 25th anniversary of the terrorist attacks that changed the United States and the world forever. A quarter century later, Americans and people around the globe continue to remember the nearly 3,000 people who lost their lives, honor the first responders and ordinary citizens who showed extraordinary courage, and reflect on the lasting legacy of 9/11.

Twenty-five years is a long time—but for millions of people who lived through September 11, 2001, the memories can still feel immediate.

The images of the World Trade Center towers, the Pentagon in flames, smoke rising over Manhattan, and the field near Shanksville, Pennsylvania, became some of the most recognizable images of the 21st century.

As the nation observes the 25th anniversary of 9/11, the day is not simply about remembering what happened. It is also about remembering the people who were lost, recognizing the sacrifices that followed, and teaching a generation that was not yet born why September 11 remains such an important part of American history.

What Happened on September 11, 2001?

On the morning of September 11, 2001, 19 al-Qaeda terrorists hijacked four commercial airplanes as part of a coordinated attack against the United States.

Two aircraft were deliberately flown into the World Trade Center towers in New York City.

American Airlines Flight 11 struck the North Tower at 8:46 a.m. United Airlines Flight 175 struck the South Tower at 9:03 a.m.

A third aircraft, American Airlines Flight 77, crashed into the Pentagon near Washington, D.C., at 9:37 a.m.

The fourth aircraft, United Airlines Flight 93, crashed into a field near Shanksville, Pennsylvania, at approximately 10:03 a.m. Passengers and crew had attempted to regain control of the aircraft after learning about the other attacks.

The four attacks killed 2,977 people, excluding the 19 hijackers.

The victims came from many different backgrounds, ages, professions, and countries. Their lives—and the lives of their families—were permanently changed.

The Heroes of September 11

The story of 9/11 is also a story of extraordinary courage.

Firefighters, police officers, emergency medical personnel, military personnel, airline crews, office workers, and ordinary citizens responded to an unprecedented disaster.

Many first responders entered the World Trade Center buildings while others were desperately trying to escape.

Hundreds of firefighters and police officers died while attempting to rescue people trapped inside the towers.

The sacrifices made that morning became one of the defining aspects of the 9/11 story.

But heroism wasn’t limited to emergency personnel.

Office workers helped colleagues escape. Strangers assisted people they had never met. People opened their homes to others stranded far from their families. Americans lined up to donate blood and supplies.

In the midst of unimaginable tragedy, countless acts of compassion emerged.

Remembering the 40 People on Flight 93

One of the most powerful chapters of September 11 took place in rural Pennsylvania.

United Airlines Flight 93 was traveling from Newark to San Francisco when its passengers and crew learned that other hijacked aircraft had been used as weapons.

Passengers made telephone calls to family members and learned what was happening.

They then attempted to take back control of the airplane.

The effort prevented Flight 93 from reaching its intended target, although the plane ultimately crashed near Shanksville.

The 40 passengers and crew members aboard Flight 93 were killed.

Today, the Flight 93 National Memorial in Pennsylvania honors their courage and sacrifice.

For the 25th anniversary, the National Park Service is holding a full day of remembrance programs at the memorial, including a morning observance and an afternoon ceremony. The September 11 observance is free and open to the public.

The 9/11 Memorial in New York

Where the World Trade Center towers once stood, the National September 11 Memorial & Museum now serves as a place of remembrance, education, and reflection.

The Memorial’s two enormous reflecting pools occupy the footprints of the North and South Towers.

The names of those killed in the attacks are inscribed around the pools.

For the 25th anniversary, family members of victims will participate in the annual commemoration ceremony by reading the names of those who died.

The ceremony begins in the morning and includes moments of silence corresponding to the major events of September 11.

The ceremony will also recognize a painful part of the 9/11 legacy that has become increasingly important over the past 25 years.

A New Moment of Silence for Those Lost to 9/11-Related Illnesses

The 25th anniversary commemoration includes a seventh moment of silence.

This moment honors people who became sick or died in the years following the attacks because of illnesses associated with exposure to hazards and toxins during the rescue, recovery, and cleanup efforts.

Thousands of first responders, recovery workers, relief workers, and people who lived or worked near Lower Manhattan have suffered serious health consequences connected to 9/11.

The addition of the seventh moment of silence recognizes that the human toll of September 11 did not end when the towers fell.

It is an important reminder that the consequences of the attacks have continued across generations.

25 Years Later, a New Generation Is Learning About 9/11

Perhaps one of the most significant differences between the 25th anniversary and earlier anniversaries is that millions of Americans alive today have no personal memory of September 11.

The 9/11 Memorial & Museum estimates that approximately 100 million Americans are too young to remember the attacks.

For these Americans, 9/11 is history rather than personal experience.

That creates a new responsibility.

Parents, teachers, museums, historians, and communities must explain what happened while preserving the human stories behind the statistics.

The challenge is not simply to teach younger generations about terrorism or geopolitics.

It is to help them understand the people who were there.

The firefighters who climbed the stairs.

The passengers who called their families.

The office workers who helped strangers.

The people who waited anxiously for loved ones who never came home.

The families whose lives changed forever.

How 9/11 Changed America

The consequences of September 11 extended far beyond New York, Washington, and Pennsylvania.

The attacks fundamentally changed American foreign policy, national security, airport security, immigration policy, intelligence operations, and military strategy.

The United States launched the War in Afghanistan and later became involved in a broader global campaign against terrorism.

At airports, security procedures that are now routine became part of everyday life.

The creation of the Transportation Security Administration transformed the American air-travel experience.

The attacks also influenced American politics, technology, surveillance, journalism, popular culture, and the way people thought about national security.

Twenty-five years later, many of these changes remain part of everyday American life.

The Human Cost Goes Beyond the Numbers

Numbers help us understand the scale of a tragedy, but numbers cannot tell the complete story.

Behind every victim was a family, a friendship, a workplace, and a community.

There were parents who lost children.

Children who grew up without a parent.

Spouses who suddenly became widows or widowers.

Friends who never received another phone call.

Coworkers whose desks remained empty.

The 25th anniversary offers an opportunity to move beyond statistics and remember the individual lives represented by every name.

That is one of the central purposes of the 9/11 Memorial.

The Meaning of “Never Forget”

The phrase “Never Forget” became closely associated with September 11.

But remembering is about more than preserving photographs or repeating a date.

To never forget means remembering the victims as individuals.

It means recognizing the courage of first responders.

It means acknowledging the sacrifices of the people who participated in rescue and recovery operations.

It means remembering the passengers and crew of Flight 93.

And it means ensuring that future generations understand what happened and why it mattered.

The 9/11 Memorial & Museum’s 25th anniversary theme emphasizes remembrance, reflection, learning, and the enduring legacy of service inspired by the attacks.

9/11 and the Spirit of Service

One of the most important legacies of September 11 has been the willingness of people to serve others.

The attacks inspired countless Americans to become firefighters, police officers, military personnel, emergency workers, volunteers, and community advocates.

The 9/11 Memorial & Museum’s new exhibition, “In Their Honor: 25 Years of 9/11-Inspired Service,” examines how people and communities transformed grief into service during the quarter century since the attacks.

That legacy demonstrates that remembrance does not have to remain passive.

People can honor those who died by helping others.

How to Observe the 25th Anniversary of 9/11

There are many ways to mark the 25th anniversary respectfully.

Visit a Memorial

The 9/11 Memorial in New York and the Flight 93 National Memorial in Pennsylvania provide places for reflection and remembrance.

Learn the Stories

Take time to learn about individual victims, first responders, survivors, and the passengers and crew of Flight 93.

Personal stories can provide a deeper understanding of what happened than statistics alone.

Observe the Moments of Silence

The official commemoration recognizes the key moments of the attacks, including when the aircraft struck the World Trade Center and Pentagon and when the towers collapsed and Flight 93 crashed.

Teach Younger Generations

For people too young to remember September 11, age-appropriate education can help preserve the historical record.

The goal should be understanding rather than fear.

Serve Your Community

Volunteering, helping a neighbor, supporting first responders, or contributing to a community organization can be a meaningful way to honor the spirit of service that emerged after 9/11.

A Quarter Century Later

Twenty-five years after September 11, the United States has changed dramatically.

Technology has transformed everyday life. A generation has grown up with smartphones and social media. The geopolitical landscape looks very different from 2001.

Yet the memories of September 11 remain.

For those who lived through the day, September 11 can still bring back powerful images and emotions.

For those born afterward, it is an important chapter of American history.

For families who lost loved ones, it remains deeply personal.

And for first responders and survivors dealing with the consequences of the attacks, the story of 9/11 continues.

The 25th anniversary is therefore not simply an anniversary of something that happened 25 years ago.

It is an opportunity to remember.

To reflect.

To learn.

And to recognize the courage and humanity that emerged from one of the darkest days in American history.

Final Thoughts: We Remember

September 11, 2001, changed America forever.

Twenty-five years later, the nation pauses to remember the 2,977 people who were killed, the thousands who were injured, the survivors, the families left behind, and the first responders and recovery workers whose lives were forever changed.

We remember New York.

We remember the Pentagon.

We remember Shanksville.

We remember Flight 93.

We remember the firefighters, police officers, emergency workers, passengers, airline crews, office workers, and ordinary citizens who demonstrated extraordinary courage.

And we remember that the story of September 11 is ultimately a story about people.

Twenty-five years later, we remember. We reflect. We honor. And we never forget.