The Freedom Tower stands tall from Trinity Church in the early morning hours on September 5, 2013. (Gordon Donovan/Yahoo News)
9/11 : Then and Now
The almost completed Freedom Tower stands behind the Empire State Building in New York, Sept. 11, 2001. (Gordon Donovan/Yahoo News)
9/11 : Then and Now
Pedestrians on the waterfront in Brooklyn, New York, look across the East River at One World Trade Center and the Manhattan skyline on Friday September 6, 2013. (Gordon Donovan/Yahoo News)
9/11 : Then and Now
A view from Park Row looking towards where the World Trade Center towers stood on Sunday, September 8, 2013. The space is currently occupied by the two 9/11 Memorial pools of the north and south towers. (Gordon Donovan/Yahoo News)
9/11 : Then and Now
Tourists and New Yorkers enjoy a beautiful day on the Brooklyn Bridge in New York City on September 6, 2013. (Gordon Donovan/Yahoo News)
9/11 : Then and Now
The south tower begins to collapse as smoke billows from both towers of the World Trade Center, in New York, on Sept. 11, 2001. In one of the most horrifying attacks ever against the United States, terrorists crashed two airliners into the World Trade Center in a deadly series of blows that brought down the twin 110-story towers. (AP Photo/Jim Collins)
9/11 : Then and Now
The Freedom Tower stands proudly on the New York City skyline just across the East River in New York, on Sept. 6, 2013. (Gordon Donovan/Yahoo News)
9/11 : Then and Now
People run from the collapse of World Trade Center Tower on Fulton Street on Sept. 11, 2001 in New York. (AP Photo/Suzanne Plunkett)
9/11 : Then and Now
Twelve years after the collapse of World Trade Center Tower on Fulton Street, constructions continues as a modern subway hub is being built on Sept. 6, 2013 in New York. (Gordon Donovan/Yahoo News)
9/11 : Then and Now
A quiet morning along Park Row on Thursday, September 6, 2012. The foreground has not changed all that much but new buildings stand in place near the twin towers stood. (Gordon Donovan/Yahoo News)
9/11 : Then and Now
Medical and emergency workers, who are standing in front of the Millenium Hilton, look towards where the World Trade Center towers used to be, after a terrorist attack on the twin towers of lower Manhattan Tuesday, Sept. 11, 2001. In an unprecedented show of terrorist horror, the 110-story towers collapsed in a shower of rubble and dust after two hijacked airliners carrying scores of passengers slammed into the sides of the twin symbols of American capitalism. (AP Photo/Mark Lennihan)
9/11 : Then and Now
Pedestrians walk past the Millenium Hotel on Church Street across from the World Trade Center on Saturday, Sept. 7, 2013. (Gordon Donovan/Yahoo News)
9/11 : Then and Now
A firefighter walks amid rubble near the base of the destroyed World Trade Center in New York on September 11, 2001. (REUTERS/Peter Morgan)
9/11 : Then and Now
Looking towards the east side of Manhattan on Vesey Street just outside the entrance of the PATH train station on Saturday, September 7, 2013. The fence surrounds the construction of 1 World Trade Center. (Gordon Donovan/Yahoo News)
9/11 : Then and Now
The ever changing landscape of lower Manhattan with the new 7 World Trade Center on Sunday, Sept. 9, 2013. (Gordon Donovan/Yahoo News)
9/11 : Then and Now
A quiet morning down in lower Manhattan on Sunday September 8, 2013. At center is the nearly completed 911 Memorial Museum. (Gordon Donovan/Yahoo News)
9/11 : Then and Now
People make their way to work from the path trains and subways on Fulton St. in New York, about a block from the twin towers stood on Thursday, Sept. 5, 2001. (Gordon Donovan/Yahoo News)
9/11 : Then and Now
Remains of the facade of Two World Trade Center is all that stands on the World Trade Center site on Wednesday, Sept. 12, 2001 in New York. (AP Photo)
9/11 : Then and Now
Visitors of the 9/11 Memorial stand at the South Tower Pool on Saturday, September 7. 2013. (Gordon Donovan/Yahoo News)
9/11 : Then and Now
The corner of Murray St. in lower Manhattan near the World Trade Center site in New York, Friday, September 7, 2013. (Gordon Donovan/Yahoo News)
9/11 : Then and Now
Remains of the facade of Two World Trade Center is all that stands after Tuesday's terrorist attack Wednesday, Sept. 12, 2001 in New York. (AP Photo/Nick Fanelli)
9/11 : Then and Now
A view of the south pool where 2 World Trade Center stood on September 8, 2013. (Gordon Donovan/Yahoo News)
9/11 : Then and Now
A street near ground zero on the evening of September 11, 2001 after the September 11 terrorist attacks on the World Trade Center in New York City. (AP Photo/Mark Lennihan)
9/11 : Then and Now
Businesses like McDonalds are open on lower Broadway on Saturday, September 7, 2013. The area is still under going construction 12 years after the attacks. (Gordon Donovan/Yahoo News)
9/11 : Then and Now
The Renovated Cortlandt Street subway station on the morning of Sept. 5, 2013 across the street from the World Trade Center in New York City. (Gordon Donovan/Yahoo News)
9/11 : Then and Now
Rubble from the World Trade Center covers the cemetery at St. Pauls Church, next to the destroyed building as rescue operations continue in New York September 12, 2001. (REUTERS/Shannon Stapleton)
9/11 : Then and Now
The cemetery at St. Pauls Church in New York on September 6, 2001. St. Pauls Church is one of the most visited places in lower Manhattan. (Gordon Donovan/Yahoo News)
9/11 : Then and Now
Pedestrians on Beekman St. flee the area of the collapsed World Trade Center in lower Manhattan following a terrorist attack on the New York landmark Tuesday, Sept. 11, 2001. (AP Photos/Amy Sancetta)
9/11 : Then and Now
A woman passes the parking garage on Beekman St. in New York, Thursday, September 5, 2013, the area that was choked by smoke and dust after the collapse of the World Trade Center in 2001. (Gordon Donovan/Yahoo News)
9/11 : Then and Now
Construction around the site of the World Trade Center continues looking down Cortlandt St., Thursday, Sept. 5, 2013. (Gordon Donovan/Yahoo News)
9/11 : Then and Now
The courtyard and gravestones of the historic Trinity Church on Sunday, Sept. 1, 2013 in New York. (Gordon Donovan/Yahoo News)
9/11 : Then and Now
Emergency workers at ground zero on Sept. 11, 2001 after the terrorist attacks on the World Trade Center in New York City. (AP Photo/Mark Lennihan)
9/11 : Then and Now
Outside Century 21 store on Church Street in Lower Manhattan in New York City on September 6, 2013. (Gordon Donovan/Yahoo News)
9/11 : Then and Now
Along Church Street, construction continues at the World Trade Center site in New York on Thursday, Sept. 5, 2013 (Gordon Donovan/Yahoo News)
9/11 : Then and Now
People walk in the street in the as construction work continues on the new World Trade Center buildings on September 6, 2013. (Gordon Donovan/Yahoo News)
Yahoo News photographer Gordon Donovan returned this week to the scenes of many memorable images taken on September 11, 2001, closely matching them with images from today.
Since then, new obstacles have arisen, requiring some adjustments in camera angles to align with photographs taken on the day of the attacks. This is the third time Donovan has revisited the New York skyline; each year presents new challenges as the landscape changes. (Yahoo News)
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