Jeremy Weine / GettyPeople watch and take pictures as a drone light show depicting the Twin Towers appears along the skyline during testing of the Tribute in Light installation in Lower Manhattan on September 9, 2026, as seen from Liberty State Park in Jersey City, New Jersey.Spencer Platt / GettyJim Maroon (right) and Victor Pedraza, workers at the National September 11 Memorial & Museum, push water brooms and vacuums through the water during the evening cleaning of one of the September 11 Memorial reflecting pools as the museum prepares to mark the 25th anniversary of the September 11 terrorist attacks, on September 3, 2026, in New York City.Mario Tama / GettyA visitor adjusts an American flag among a display of nearly 3,000 flags at Pepperdine University in Malibu, California, honoring lives lost during the September 11 terrorist attacks on September 10, 2026.David Dee Delgado / ReutersA firefighter fixes a photo of a first responder who died on 9/11 during the Fire Department of the City of New York’s (FDNY) memorial service, ahead of the 25th anniversary of the September 11 attacks on the World Trade Center, in the Staten Island borough of New York City, on September 9, 2026.Adam Gray / APNames of New Jersey residents who died on 9/11 are spotlighted on the Empty Sky September 11 memorial on September 9, 2026, in Jersey City, New Jersey.Angelina Katsanis / APA young boy uses a memorial candle to count the faces of fallen firefighters at the Brooklyn 9/11 Wall of Remembrance during the annual candlelight ceremony in Coney Island on the eve of the 25th anniversary of the September 11 World Trade Center attacks, September 10, 2026, in New York.Pete Kiehart / The Washington Post / GettyJoan Platz, a survivor of the September 11 attack on the Pentagon, poses for a portrait on a bench at the National 9/11 Pentagon Memorial on September 7, 2026 in Arlington, Virginia. Each bench memorializes a person who died in the attack; this bench represents U.S. Navy Captain Robert Dolan, who was Platz’s classmate at the Naval Academy. This was Platz’s first visit to the memorial.Angelina Katsanis / APPeople hold candles during the Brooklyn 9/11 Wall of Remembrance Candlelight Ceremony in Coney Island on September 10, 2026.Gary Hershorn / GettyA woman takes a photograph of the two beams of light that make up the Tribute in Light as it is illuminated over Lower Manhattan ahead of the 25th anniversary of the attack on the World Trade Center on September 9, 2026, in New York City.Adam Gray / APAn American flag flies, with the Lower Manhattan skyline in the background, on September 9, 2026, in Jersey City, New Jersey.Jonathan Brady / PA Images / GettyIn London, England, a member of the United States Marine Corps carries a memorial wreath during a commemoration ceremony at the U.S. embassy, marking the 25th anniversary of the 9/11 attacks, on September 10, 2026.Emanuele Cremaschi / GettyIn Milan, Italy, Italian firefighters take part in a memorial stair climb on September 11, 2026. The group of 70 Italian firefighters, along with seven American firefighters from the Aviano Air Base, are climbing Milan’s 33-story Torre Galfa in honor of the 343 members of the FDNY killed during the collapse of the World Trade Center towers on September 11. The firefighters undertook an up-and-down circuit of the stairwells four times, wearing 20-kilogram (40-pound) turnout gear.Marcus Brandt / DPA / GettyIn Hamburg, Germany, firefighters lay flowers at a memorial stone in front of the former U.S. consulate general on the Outer Alster during a memorial ceremony on September 11, 2026, marking the 25th anniversary of the September 11 terrorist attacks.Jay Janner / The Austin American-Statesman / GettyIn Round Rock, Texas, members of the Civil Air Patrol-U.S. Air Force Auxiliary place American flags during the fifth annual 9/11 Flag Tribute presented by the Texas Fallen Project at Yonders Point in Old Settlers Park, on September 4, 2026. Volunteers placed 5,000 flags to honor the 2,977 people killed in the attacks and veterans and first responders who have died in the line of duty since then.Matthew Hatcher / AFP / GettyIn Shanksville, Pennsylvania, visitors to the Flight 93 National Memorial watch as 20 artists from across the country draw chalk portraits of the passengers and crew of Flight 93, on September 10, 2026.Saul Loeb / AFP / GettyMilitary personnel and first responders watch as an American flag hangs from the side of the Pentagon to commemorate the 25th anniversary of the September 11 attacks in Washington, D.C., on September 11, 2026.Dave Sanders / The New York Times / APA woman mourns at the September 11 Memorial plaza in Lower Manhattan ahead of a ceremony commemorating the 25th anniversary of the attacks, on September 11, 2026.Mario Tama / GettyAmerican flags fly among a display of nearly 3,000 flags honoring lives lost during the September 11 terrorist attacks at Pepperdine University on September 10, 2026, in Malibu, California.Gene J. Puskar / APVisitors to the Flight 93 National Memorial in Shanksville, Pennsylvania, attend an observance on September 11, 2026.Jeenah Moon / GettyFDNY firefighters pay their respects at the reflecting pools at the National September 11 Memorial & Museum on September 11, 2026, in New York City.Spencer Platt / GettyPeople pause at the memorial during a ceremony at the National September 11 Memorial & Museum on September 11, 2026.Michael M. Santiago / GettyPeople watch a ceremony commemorating the 25th anniversary of the September 11 terrorist attacks at the National September 11 Memorial & Museum on September 11, 2026.Spencer Platt / GettyMembers of the Royal Canadian Mounted Police look on during a memorial ceremony at the National September 11 Memorial & Museum in New York City on September 11, 2026.Jeenah Moon / GettyMatt Dunleavy and his daughter stand beside the reflecting pools at the September 11 Memorial during the ceremony on September 11, 2026.