Looking solemn in hard-hats covered in commemorative stickers, World Trade Centre workers posed for a final photo moments before the silver spire was raised atop the new skyscraper.

Now the tallest building in the Western hemisphere, the shining new Freedom Tower stands at the site of the 11 September 2001 terror attacks.

Its height, 1,776ft, is a reference to the year of America's independence. It towers above a memorial to those 3,000 people killed when two planes, piloted by al Qaeda hijackers crashed into the Twin Towers, causing both buildings to collapse.

world trade

Workers pose for a photo prior to raising the silver spire atop the 1 World Trade Center building

The 408ft spire will serve as a broadcast antenna, and offices, observation decks, restaurants and a museum will be housed in the building.

Last week, construction director Steven Plate told WABC that the spire will be a "beacon that'll be seen for miles around and give a tremendous indication to people around the entire region, and the world, that we're back and we're better than ever."

world trade centre

A 408-foot spire is set into place at the top of One World Trade Center

world trade centre

With the spire, the building rises at a symbolic 1,776 feet tall

The tower is slated to open in 2014, and tenants include Vogue publisher Conde Nast and the government's General Services Administration.

Freedom Tower stands in the northwest corner of the site where the twin towers were destroyed. Other buildings are also under construction in the area, including 72-story Four World Trade Center.

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  • The final piece of spire is hoisted in place on top of One World Trade Center, Friday, May 10, 2013 in New York. The addition of the spire, and its raising of the building’s height to 1,776 feet, would make One World Trade Center the tallest structure in the U.S. and third-tallest in the world. (AP photo/Mark Lennihan)

  • One World Trade Center stands at its full height above the New York City skyline in this view from the Heights neighborhood of Jersey City, N.J., Friday, May 10, 2013. A 408-foot spire was set into place at the top of the structure Friday, making the building a symbolic 1,776 feet tall. (AP Photo/Julio Cortez)

  • Workers prepare to raise the silver spire atop the 1 World Trade Center building in New York early Friday May 10, 2013. The 408-foot spire will serve as a world-class broadcast antenna. An LED-powered light emanating from it will be seen from miles away. When it is fully installed on the building’s roof, it will bring the iconic structure to its full, symbolic height of 1,776 feet. (AP Photo/Mark Lennihan)

  • A 408-foot spire is set into place at the top of One World Trade Center seen from the Heights neighborhood of Jersey City, N.J., Friday, May 10, 2013. With the spire, the building rises at a symbolic 1,776 feet tall. (AP Photo/Julio Cortez)

  • Workers pose for a photo prior to raising the silver spire atop the 1 World Trade Center building in New York early Friday May 10, 2013. The 408-foot spire will serve as a world-class broadcast antenna. An LED-powered light emanating from it will be seen from miles away. When it is fully installed on the building’s roof, it will bring the iconic structure to its full, symbolic height of 1,776 feet. (AP Photo/Mark Lennihan)

  • A 408-foot spire is set into place at the top of One World Trade Center seen from the Heights neighborhood of Jersey City, N.J., Friday, May 10, 2013. With the spire, the building rises at a symbolic 1,776 feet tall. (AP Photo/Julio Cortez)

  • A crane lifts into place a 408-foot spire at the top of One World Trade Center seen from the Heights neighborhood of Jersey City, N.J., Friday, May 10, 2013. With the spire, the building rises at a symbolic 1,776 feet tall. (AP Photo/Julio Cortez)

  • The top piece of the 408-foot spire for One World Trade Center is lifted to the top of the building in New York, Thursday, May 2, 2013. When it's fully installed, at a later date, it will top the building at a symbolic 1,776 feet. (AP Photo/Seth Wenig)

  • A harness is lowered to the final piece of spire before it is hoisted to the roof of One World Trade Center, Thursday, May 2, 2013 in New York. The piece will be attached to the spire at a later date, capping off the tower at 1,776 feet. (AP Photo/Mark Lennihan)

  • The top piece of the 408-foot spire for One World Trade Center is lifted to the top of the building in New York, Thursday, May 2, 2013. When installed it will top the building at a symbolic 1776 feet. (AP Photo/Seth Wenig)

  • Tommy Hickey

    Ironworker Tommy Hickey holds a guide rope as the final piece of spire is hoisted to the roof of One World Trade Center, Thursday, May 2, 2013 in New York. The piece will be attached to the spire at a later date, capping off the tower at 1,776 feet. (AP Photo/Mark Lennihan)

  • Construction workers watch as the final piece of spire is hoisted to the roof of One World Trade Center, Thursday, May 2, 2013 in New York. The piece will be attached to the spire at a later date, capping off the tower at 1,776 feet. (AP Photo/Mark Lennihan)

  • The final piece of the spire is hoisted to the roof of One World Trade Center, Thursday, May 2, 2013 in New York. The piece will be attached to the spire at a later date, capping off the tower at 1,776 feet. (AP Photo/Mark Lennihan)

  • The top piece of the 408-foot spire for One World Trade Center is lifted to the top of the building in New York, Thursday, May 2, 2013. When it's fully installed, at a later date, it will top the building at a symbolic 1,776 feet. (AP Photo/Seth Wenig)

  • A worker holds a guide rope as the final piece of spire is hoisted to the roof of One World Trade Center, Thursday, May 2, 2013 in New York. The piece will be attached to the spire at a later date, capping off the tower at 1,776 feet. (AP Photo/Mark Lennihan)

  • Workers attach a harness to the final piece of spire before it is hoisted to the roof of One World Trade Center, Thursday, May 2, 2013 in New York. The piece will be attached to the spire at a later date, capping off the tower at 1,776 feet. (AP Photo/Mark Lennihan)

  • The final piece of spire is hoisted to the roof of One World Trade Center, Thursday, May 2, 2013 in New York. The piece will be attached to the spire at a later date, capping off the tower at 1,776 feet. (AP Photo/Mark Lennihan)

  • Construction workers watch as the final sections of the spire is raised to the top of One World Trade Center May 2, 2013 in New York to a temporary work platform atop the structure. Ironworkers will install the sections at a later date and when complete, One WTC will stand 1,776 feet (541 meters) high, making it the tallest building in the Western Hemisphere. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • Construction workers watch as the final sections of the spire is raised to the top of One World Trade Center May 2, 2013 in New York to a temporary work platform atop the structure. Ironworkers will install the sections at a later date and when complete, One WTC will stand 1,776 feet (541 meters) high, making it the tallest building in the Western Hemisphere. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • The final sections of the spire is raised to the top of One World Trade Center May 2, 2013 in New York to a temporary work platform atop the structure. Ironworkers will install the sections at a later date and when complete, One WTC will stand 1,776 feet (541 meters) high, making it the tallest building in the Western Hemisphere. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • Ironworker Tommy Hickey (L) holds a rope as the final sections of the spire is raised to the top of One World Trade Center May 2, 2013 in New York to a temporary work platform atop the structure. Ironworkers will install the sections at a later date and when complete, One WTC will stand 1,776 feet (541 meters) high, making it the tallest building in the Western Hemisphere. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • Ironworker Tommy Hickey (L) holds a rope as the final sections of the spire is raised to the top of One World Trade Center May 2, 2013 in New York to a temporary work platform atop the structure. Ironworkers will install the sections at a later date and when complete, One WTC will stand 1,776 feet (541 meters) high, making it the tallest building in the Western Hemisphere. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • Construction workers watch as the final sections of the spire is raised to the top of One World Trade Center May 2, 2013 in New York to a temporary work platform atop the structure. Ironworkers will install the sections at a later date and when complete, One WTC will stand 1,776 feet (541 meters) high, making it the tallest building in the Western Hemisphere. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • The final sections of the spire (R) is raised to the top of One World Trade Center May 2, 2013 in New York to a temporary work platform atop the structure. Ironworkers will install the sections at a later date and when complete, One WTC will stand 1,776 feet (541 meters) high, making it the tallest building in the Western Hemisphere. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • The final sections of the spire (R of center) is raised to the top of One World Trade Center (bottom) May 2, 2013 in New York to a temporary work platform atop the structure. Ironworkers will install the sections at a later date and when complete, One WTC will stand 1,776 feet (541 meters) high, making it the tallest building in the Western Hemisphere. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • Cranes work adjacent to the spire on top of One World Trade Center, Wednesday, May 1, 2013 in New York. The last piece of spire will be hoisted to the roof on Thursday, weather permitting, according to a spokesperson for the Port Authority of New York and New Jersey. (AP Photo/Mark Lennihan)

  • The top piece of the 408-foot spire for One World Trade Center is shown at ground level, Wednesday, May 1, 2013 in New York. The piece will be hoisted to the roof on Thursday, weather permitting, according to a spokesperson for the Port Authority of New York and New Jersey, (AP Photo/Mark Lennihan)

  • The top piece of the 408-foot spire for One World Trade Center, left, is shown at ground level, Wednesday, May 1, 2013 in New York. The piece will be hoisted to the roof on Thursday, weather permitting, according to a spokesperson for the Port Authority of New York and New Jersey, (AP Photo/Mark Lennihan)

  • Cranes work adjacent to the spire on top of One World Trade Center, Wednesday, May 1, 2013 in New York. The last piece of spire will be hoisted to the roof on Thursday, weather permitting, according to a spokesperson for the Port Authority of New York and New Jersey. (AP Photo/Mark Lennihan)

  • A detail of the top piece of the 408-foot spire for One World Trade Center is shown at ground level, Wednesday, May 1, 2013 in New York. The piece will be hoisted to the roof on Thursday, weather permitting, according to a spokesperson for the Port Authority of New York and New Jersey, (AP Photo/Mark Lennihan)

  • Construction cranes work on top of One World Trade Center, Wednesday, May 1, 2013 in New York. Officials with the Port Authority of New York and New Jersey are hoping that the final pieces of the spire will be installed soon, making the tower 1776 feet tall. (AP Photo/Mark Lennihan)

  • Cranes work adjacent to the spire on top of One World Trade Center, Wednesday, May 1, 2013 in New York. The last piece of spire will be hoisted to the roof on Thursday, weather permitting, according to a spokesperson for the Port Authority of New York and New Jersey. (AP Photo/Mark Lennihan)

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  • Port Authority Offers Media Tour Of One World Trade Observatory On 100th Floor

    NEW YORK, NY - APRIL 02: Manhattan is seen from One World Observatory from the 100th floor of One World Trade Center at the Ground Zero site on April 2, 2013 in New York City. One World Observatory, which is situated more than 1,250 feet over lower Manhattan, will open to the public in 2015 and will include a pre-show theater, multiple spaces that allow for panoramas of the New York City region and numerous dining options. When completed, One World Trade Center will be the tallest building in the Western Hemisphere at 1776 feet. (Photo by Spencer Platt/Getty Images)

  • US-ATTACKS-WTC-PREVIEW

    People look at the view as officials from The Durst Organization, Legends Hospitality LLC and The Port Authority of New York & New Jersey give a preview to the news media of the One World Observatory site, the planned public observation deck under construction on the 100th floor of One World Trade Center April 2, 2013 in New York. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • David Checketts

    Legends Chairman & CEO David Checketts, at podium center, of the company that will run the observation deck on the 100th floor of the One World Trade Center building, address a news conference in the venue, in New York, Tuesday, April 2, 2013. The observation deck, that will not open until 2015, will occupy the tower's 100th through 102nd floors. Elevators will whisk visitors to the top in just one minute but the experience of visiting the attraction will take an hour. (AP Photo/Richard Drew)

  • David Samson

    Port Authority Chairman David Samson, at podium center left, addresses a news conference in observation deck on the 100th floor of the One World Trade Center building, under construction in New York, Tuesday, April 2, 2013. The observation deck will occupy the tower's 100th through 102nd floors. Elevators will whisk visitors to the top in just one minute but the experience of visiting the attraction will take an hour. (AP Photo/Richard Drew)

  • Members of the media tour the unfinished observation deck on the 100th floor of the One World Trade Center building, under construction in New York, Tuesday, April 2, 2013. The observation deck will occupy the tower's 100th through 102nd floors. Elevators will whisk visitors to the top in just one minute but the experience of visiting the attraction will take an hour. (AP Photo/Richard Drew)

  • A member of the media takes a photograph of the Manhattan skyline from the unfinished observation deck on the 100th floor of the One World Trade Center building, under construction in New York, Tuesday, April 2, 2013. The observation deck will occupy the tower's 100th through 102nd floors. Elevators will whisk visitors to the top in just one minute but the experience of visiting the attraction will take an hour. (AP Photo/Richard Drew)

  • Members of the media tour the unfinished observation deck on the 100th floor of the One World Trade Center building, under construction in New York, Tuesday, April 2, 2013. The observation deck will occupy the tower's 100th through 102nd floors. Elevators will whisk visitors to the top in just one minute but the experience of visiting the attraction will take an hour. (AP Photo/Richard Drew)

  • A Port Authority worker cleans a window of the unfinished observation deck on the 100th floor of the One World Trade Center building, under construction in New York, Tuesday, April 2, 2013. The observation deck will occupy the tower's 100th through 102nd floors. Elevators will whisk visitors to the top in just one minute but the experience of visiting the attraction will take an hour. (AP Photo/Richard Drew)

  • US-ATTACKS-WTC-PREVIEW

    People look at the view as officials from The Durst Organization, Legends Hospitality LLC and The Port Authority of New York & New Jersey give a preview to the news media of the One World Observatory site, the planned public observation deck under construction on the 100th floor of One World Trade Center April 2, 2013 in New York. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • US-ATTACKS-WTC-PREVIEW

    People photograph the view as officials from The Durst Organization, Legends Hospitality LLC and The Port Authority of New York & New Jersey give a preview to the news media of the One World Observatory site, the planned public observation deck under construction on the 100th floor of One World Trade Center April 2, 2013 in New York. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • US-ATTACKS-WTC-PREVIEW

    People photograph the view as officials from The Durst Organization, Legends Hospitality LLC and The Port Authority of New York & New Jersey give a preview to the news media of the One World Observatory site, the planned public observation deck under construction on the 100th floor of One World Trade Center April 2, 2013 in New York. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • US-ATTACKS-WTC-PREVIEW

    Dave Checketts (front, L), Chairman and CEO of Legends, along with officials from The Durst Organization, Legends Hospitality LLC and The Port Authority of New York & New Jersey give a preview to the news media of the One World Observatory site, the planned public observation deck under construction on the 100th floor of One World Trade Center April 2, 2013 in New York. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • US-ATTACKS-WTC-PREVIEW

    Dave Checketts (front, L), Chairman and CEO of Legends, along with officials from The Durst Organization, Legends Hospitality LLC and The Port Authority of New York & New Jersey give a preview to the news media of the One World Observatory site, the planned public observation deck under construction on the 100th floor of One World Trade Center April 2, 2013 in New York. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • US-ATTACKS-WTC-PREVIEW

    People photograph the view as officials from The Durst Organization, Legends Hospitality LLC and The Port Authority of New York & New Jersey give a preview to the news media of the One World Observatory site, the planned public observation deck under construction on the 100th floor of One World Trade Center April 2, 2013 in New York. An artists' version of the Observatory is seen on a video screen (R).AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • US-ATTACKS-WTC-PREVIEW

    Officials from The Durst Organization, Legends Hospitality LLC and The Port Authority of New York & New Jersey give a preview to the news media of the One World Observatory site, the planned public observation deck under construction on the 100th floor of One World Trade Center April 2, 2013 in New York. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • US-ATTACKS-WTC-PREVIEW

    Officials from The Durst Organization, Legends Hospitality LLC and The Port Authority of New York & New Jersey give a preview to the news media of the One World Observatory site, the planned public observation deck under construction on the 100th floor of One World Trade Center April 2, 2013 in New York. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • US-ATTACKS-WTC-PREVIEW

    Television crews photograph the view as officials from The Durst Organization, Legends Hospitality LLC and The Port Authority of New York & New Jersey give a preview to the news media of the One World Observatory site, the planned public observation deck under construction on the 100th floor of One World Trade Center April 2, 2013 in New York. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • US-ATTACKS-WTC-PREVIEW

    People look at the view as officials from The Durst Organization, Legends Hospitality LLC and The Port Authority of New York & New Jersey give a preview to the news media of the One World Observatory site, the planned public observation deck under construction on the 100th floor of One World Trade Center April 2, 2013 in New York. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • Port Authority Offers Media Tour Of One World Trade Observatory On 100th Floor

    NEW YORK, NY - APRIL 02: The Manhattan Bridge is seen from the One World Observatory from the 100th floor of One World Trade Center at the Ground Zero site on April 2, 2013 in New York City. One World Observatory, which is situated more than 1,250 feet over lower Manhattan, will open to the public in 2015 and will include a pre-show theater, multiple spaces that allow for panoramas of the New York City region and numerous dining options. When completed, One World Trade Center will be the tallest building in the Western Hemisphere at 1776 feet. (Photo by Spencer Platt/Getty Images)

  • Port Authority Offers Media Tour Of One World Trade Observatory On 100th Floor

    NEW YORK, NY - APRIL 02: Visitors stand near the windows of the One World Observatory from the 100th floor of One World Trade Center at the Ground Zero site on April 2, 2013 in New York City. One World Observatory, which is situated more than 1,250 feet over lower Manhattan, will open to the public in 2015 and will include a pre-show theater, multiple spaces that allow for panoramas of the New York City region and numerous dining options. When completed, One World Trade Center will be the tallest building in the Western Hemisphere at 1776 feet. (Photo by Spencer Platt/Getty Images)

  • US-ATTACKS-WTC-PREVIEW

    A view of One World Trade Center (R) as officials from The Durst Organization, Legends Hospitality LLC and The Port Authority of New York & New Jersey give a preview to the news media of the One World Observatory site, the planned public observation deck under construction on the 100th floor of One World Trade Center April 2, 2013 in New York. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • US-ATTACKS-WTC-PREVIEW

    A view of Manhattan looking north as officials from The Durst Organization, Legends Hospitality LLC and The Port Authority of New York & New Jersey give a preview to the news media of the One World Observatory site, the planned public observation deck under construction on the 100th floor of One World Trade Center April 2, 2013 in New York. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • US-ATTACKS-WTC-PREVIEW

    A tug boat passes under the Brooklyn Bridge as seen from One World Trade Center as officials from The Durst Organization, Legends Hospitality LLC and The Port Authority of New York & New Jersey give a preview to the news media of the One World Observatory site, the planned public observation deck under construction on the 100th floor of One World Trade Center April 2, 2013 in New York. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • US-ATTACKS-WTC-PREVIEW

    A view of One World Trade Center as officials from The Durst Organization, Legends Hospitality LLC and The Port Authority of New York & New Jersey give a preview to the news media of the One World Observatory site, the planned public observation deck under construction on the 100th floor of One World Trade Center April 2, 2013 in New York. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • Port Authority Offers Media Tour Of One World Trade Observatory On 100th Floor

    NEW YORK, NY - APRIL 02: Members of the Port Authority Police stand near the windows in the One World Observatory from the 100th floor of One World Trade Center at the Ground Zero site on April 2, 2013 in New York City. One World Observatory, which is situated more than 1,250 feet over lower Manhattan, will open to the public in 2015 and will include a pre-show theater, multiple spaces that allow for panoramas of the New York City region and numerous dining options. When completed, One World Trade Center will be the tallest building in the Western Hemisphere at 1776 feet. (Photo by Spencer Platt/Getty Images)

  • Port Authority Offers Media Tour Of One World Trade Observatory On 100th Floor

    NEW YORK, NY - APRIL 02: Pedestrians cross the street in lower Manhattan as seen from One World Observatory from the 100th floor of One World Trade Center at the Ground Zero site on April 2, 2013 in New York City. One World Observatory, which is situated more than 1,250 feet over lower Manhattan, will open to the public in 2015 and will include a pre-show theater, multiple spaces that allow for panoramas of the New York City region and numerous dining options. When completed, One World Trade Center will be the tallest building in the Western Hemisphere at 1776 feet. (Photo by Spencer Platt/Getty Images)

  • US-ATTACKS-WTC-PREVIEW

    A view of Manhattan looking north as officials from the Durst Organization, Legends Hospitality LLC., and the Port Authority of New York & New Jersey give a preview to the news media of the One World Observatory site, the planned public observation deck under construction on the 100th floor of One World Trade Center April 2, 2013 in New York. AFP PHOTO/Stan HONDA (Photo credit should read STAN HONDA/AFP/Getty Images)

  • Port Authority Offers Media Tour Of One World Trade Observatory On 100th Floor

    NEW YORK, NY - APRIL 02: Visitors stand near the windows of the One World Observatory from the 100th floor of One World Trade Center at the Ground Zero site on April 2, 2013 in New York City. One World Observatory, which is situated more than 1,250 feet over lower Manhattan, will open to the public in 2015 and will include a pre-show theater, multiple spaces that allow for panoramas of the New York City region and numerous dining options. When completed, One World Trade Center will be the tallest building in the Western Hemisphere at 1776 feet. (Photo by Spencer Platt/Getty Images)

  • Port Authority Offers Media Tour Of One World Trade Observatory On 100th Floor

    NEW YORK, NY - APRIL 02: Visitors stand near the windows of the One World Observatory from the 100th floor of One World Trade Center at the Ground Zero site on April 2, 2013 in New York City. One World Observatory, which is situated more than 1,250 feet over lower Manhattan, will open to the public in 2015 and will include a pre-show theater, multiple spaces that allow for panoramas of the New York City region and numerous dining options. When completed, One World Trade Center will be the tallest building in the Western Hemisphere at 1776 feet. (Photo by Spencer Platt/Getty Images)