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After being hit by American Flight 11 the north tower smoulders in the background as United Flight 175 takes aim at the south tower at 9:03 am on 9/11/2001

4 Easy, Delicious Vegetarian Recipes to Try at Home

After being hit by American Flight 11 the north tower smoulders in the background as United Flight 175 takes aim at the south tower at 9:03 am on 9/11/2001

30 Hudson Yards, 500 West 33rd Street, former North Tower, Hudson Yards Development, 10th Avenue-33rd Street, New York City by KPF Architects :: 80 floors, height 374m, office tower :: Under Construction

30 Hudson Yards, 500 West 33rd Street, former North Tower, Hudson Yards Development, 10th Avenue-33rd Street, New York City by KPF Architects :: 80 floors, height 374m, office tower :: Under Construction

Smoke pours from a gaping hole and the upper floors of the World Trade Center's North Tower, shortly after hijackers crashed American Airlines Flight 11 into the building on September 11, 2001 in New York City. (AP Photo/Richard Drew)

9/11: The Day of the Attacks

Smoke pours from a gaping hole and the upper floors of the World Trade Center's North Tower, shortly after hijackers crashed American Airlines Flight 11 into the building on September 11, 2001 in New York City. (AP Photo/Richard Drew)

"Golden Gate Bridge, North Tower, San Francisco" by Raj Hanchanahal Photography on Flickr - A view of Transamerica Pyramid Building at night through the north tower of the Golden Gate Bridge from Marin Headlands.

"Golden Gate Bridge, North Tower, San Francisco" by Raj Hanchanahal Photography on Flickr - A view of Transamerica Pyramid Building at night through the north tower of the Golden Gate Bridge from Marin Headlands.

Stokesay Castle, Shropshire, England, UK - north tower, taken from the moat.

Stokesay Castle, Shropshire, England, UK - north tower, taken from the moat.

Xiamen Eton Center North Tower, Xiamen, China designed by NBBJ Architects :: 51 floors, height 229m

Xiamen Eton Center North Tower, Xiamen, China designed by NBBJ Architects :: 51 floors, height 229m

The north tower of the the World Trade Center collapses in New York in this September 11, 2001 file photo.

The north tower of the the World Trade Center collapses in New York in this September 11, 2001 file photo.

*9/11:  Though nearly 3,000 people died in the attacks in New York, Pennsylvania + Washington, tens of thousands of workers safely escaped in the World Trade Center that day... Rise and Fall - Photographs - NYTimes.com

*9/11: Though nearly 3,000 people died in the attacks in New York, Pennsylvania + Washington, tens of thousands of workers safely escaped in the World Trade Center that day... Rise and Fall - Photographs - NYTimes.com

North Tower, Hudson Yards Development, 10th Avenue - 33rd Street, New York City by KPF Architects :: 80 floors, height 407m, office tower

North Tower, Hudson Yards Development, 10th Avenue - 33rd Street, New York City by KPF Architects :: 80 floors, height 407m, office tower

Painters on the north tower of the Golden Gate Bridge, San Francisco, 1958

Painters on the north tower of the Golden Gate Bridge, San Francisco, 1958

Full Moon over the North Tower  Golden Gate National Recreation Area, California, USA

Full Moon over the North Tower Golden Gate National Recreation Area, California, USA

The north tower continues to burn after the collapse of the south tower

The north tower continues to burn after the collapse of the south tower

While most people below the crash zones of the towers lived, all but four people at or above the impact zones died. In this tragic video, people hang out of the windows in the north tower impact zone calling for help. The North Tower was struck between the 93rd and 98th floors at approximately 8:46 a.m. The building, 1 World Trade Center, was among the tallest in the world when it was built.

9/11 Attacks Seen by First-Person Footage (Video)

While most people below the crash zones of the towers lived, all but four people at or above the impact zones died. In this tragic video, people hang out of the windows in the north tower impact zone calling for help. The North Tower was struck between the 93rd and 98th floors at approximately 8:46 a.m. The building, 1 World Trade Center, was among the tallest in the world when it was built.