New York City and 9/11 - 2001 vs 2011 - pictures

(Top) The south tower starts to collapse as smoke billows from both buildings of the World Trade Center in New York. (Below) One World Trade Center rises in 2011. (AP Photo/ Jim Collins)

(Top) Smoke rises into the sky following the collapse of World Trade Center Towers Tuesday, Sept. 11, 2001 in New York. (Below) One World Trade Center rises in 2011. (AP Photo/ Mark Lennihan)

(Top) Medical and emergency workers look towards where the World Trade Center towers used to be. (Below) Pedestrians pass the Hilton Hotel on Church St. on Aug. 4, 2011 (AP Photo/ Mark Lennihan)

(Top) The World Trade Center destruction is shown in the aftermath of the Sept. 11 attacks. (Below) Four World Trade Center is under construction in lower Manhattan, Aug. 9, 2011. (AP Photo/ Mark Lennihan)

(Top) A street near ground zero on the evening of September 11, 2001 after the September 11 attacks. (Below) Pedestrians pass a McDonald's on Broadway on Aug. 4, 2011. (AP Photo/ Mark Lennihan)

(Top) Firefighters work beneath the destroyed mullions of the World Trade Center towers. (Below) Four World Trade Center is under construction in lower Manhattan, Aug. 4, 2011. (Photo/Mark Lennihan)

(Top) Pedestrians flee the area of the World Trade Center as the south tower collapses. (Below) One World Trade Center is under construction in lower Manhattan, Aug. 4, 2011, (AP Photo/ Mark Lennihan)

(Top) Pedestrians flee the area of the World Trade Center as the center's south tower collapses. (Below) Activity on Park Row is shown in lower Manhattan, Aug. 4, 2011 in New York. (AP Photo/ Mark Lennihan)

(Top) People covered in dust walk over debris near the World Trade Center in New York. (Below) Pedestrians walk near the World Trade Center in lower Manhattan, Aug. 8, 2011. (AP Photo/ GULNARA SAMOILOVA)

(Top) A destroyed subway station near ground zero on the evening of Sept. 12, 2001. (Below) Pedestrians walk along Church St. in lower Manhattan, Aug. 4, 2011 in New York. (AP Photo/ Mark Lennihan)

(Top) Emergency workers at ground zero. (Below) Pedestrians walk along Church St. past Century 21 clothing store in lower Manhattan, Aug. 4, 2011, in New York. (AP Photo/ Mark Lennihan)

NEW YORK (WABC) -- Each year, New York City and millions around the country commemorate 9/11 with mournful ceremonies, volunteering, appeals to "never forget," and drawing attention to the terror attacks' continued toll on first responders.

Relatives of the victims descend on ground zero in Lower Manhattan, and the events of that terrible day and the weeks, months and years that followed are never forgotten, nor are the memories of those killed by terrorists in hijacked planes.
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Additionally, we remember all those who have died from 9/11-related illnesses from their heroic work at ground zero and those who suffer today.

PHOTOS: 9/11 Tribute in Light through the years

September 11 still shapes American policy, politics and everyday experiences in places from airports to office buildings, even if it's less of a constant presence in the public consciousness after 19 years.

The 9/11 commemorations are by now familiar rituals, but each year at ground zero, victims' relatives infuse the ceremony with personal messages of remembrance, inspiration and concern.

Related: 'Finding Fifteen' recounts lives, passions of 9/11 victims

In the photo gallery above, see images of New York City on September 11, 2001, juxtaposed with the same setting at other times.
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This gallery was created in 2011 to mark the 10-year anniversary of the attacks.

CLICK HERE for more Eyewitness News reflections, photos and stories marking the anniversary of 9/11

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PHOTOS: New York City and 9/11 - 2001 vs 2011