How tall was the 911 twin tower?

At the time of their completion, the Twin Towers—the original 1 World Trade Center (the North Tower) at 1,368 feet (417 m), and 2 World Trade Center (the South Tower) at 1,362 feet (415.1 m)—were the tallest buildings in the world.



The original Twin Towers of the World Trade Center in New York City were architectural marvels of their time. The North Tower (1 WTC) stood at 1,368 feet (417 meters), while the South Tower (2 WTC) was slightly shorter at 1,362 feet (415 meters). While both towers had 110 floors, the North Tower appeared taller from a distance because it was topped with a massive 360-foot telecommunications antenna, bringing its total structural tip height to 1,728 feet (526.7 meters). For comparison, the South Tower featured the famous "Top of the World" observation deck, which included an outdoor platform at 1,377 feet above street level—the highest in the world at the time it opened. In 2026, the current One World Trade Center (the "Freedom Tower") pays homage to this history by standing at a symbolic height of 1,776 feet, representing the year of the United States' independence. The footprints of the original towers are now preserved as the 9/11 Memorial's "Reflecting Absence" pools, which maintain the exact dimensions of the base of each tower.

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One World Trade Center in Lower Manhattan is the tallest building in the United States, the Americas and the Western Hemisphere. Since its topping out in 2013, One World Trade Center in New York City has been the tallest skyscraper in the United States.

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8:46:40: Flight 11 crashes into the north face of the North Tower of the World Trade Center, between floors 93 and 99. No passengers survive the crash and an unknown number of people inside the building are also instantly killed.

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The World Trade Center is a mostly completed complex of buildings in the Lower Manhattan neighborhood of New York City, replacing the original seven buildings on the same site that were destroyed in the September 11 attacks of 2001.



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Nineteen terrorists from al-Qaeda hijacked four commercial airplanes, deliberately crashing two of the planes into the upper floors of the North and South Towers of the World Trade Center complex and a third plane into the Pentagon in Arlington, Virginia.

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The 9/11 Memorial Stair Climbs 9/11 Memorial Stair Climbs honor FDNY firefighters who made the ultimate sacrifice. Each 9/11 Memorial Stair Climb participants pays tribute to a FDNY firefighter by climbing or walking the equivalent of the 110 stories of the World Trade Center.

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Each of the Twin Towers had 110 floors. Each tower's footprint and floors were approximately an acre in size. On windy days, each tower could sway up to almost 12 inches side to side. There were 43,600 windows in the Twin Towers, equating to more than 600,000 square feet of glass.

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