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1 World Trade Center was also referred to as the North Tower. 2 World Trade Center was also referred to as the South Tower.
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The Twin Towers could house 50,000 employees in its 10 million square feet of office space.
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The Twin Towers were at the heart of New York City's Financial District.
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The Twin Towers were part of a seven-building complex called the World Trade Center Complex. The other five buildings included 3 World Trade Center, 5 World Trade Center, 6 World Trade Center, and 7 World Trade Center.
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The cost to build the World Trade Center Complex was $400 million in 1973. By today's value this would be equal to $2.3 billion.
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The Port Authority wanted the Twin Towers to beat the Empire State Building for the title of world's tallest building.
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It took more than 10,000 workers to build the Twin Towers. 60 of those workers lost their lives during its construction.
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A French tightrope walker named Phillipe Petit strung up a rope between the Twin Towers in 1974 and walked across from one tower to the other.
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In 1993 a terrorist attacked the North Tower by planting a bomb in its underground garage. He used 1500 pounds of explosives and the blast tore a hole 100 feet up five levels. Six people were killed and more than 1000 more injured.
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There were 7 levels under the Twin Towers which held a subway station, shopping stores, and services.
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There were 43,600 windows in the Twin Towers.
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87 tons of food was delivered on a daily basis to the World Trade Center Complex.
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There were a total of 17 babies born at the World Trade Center Complex.
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Three men jumped from the top of the Twin Towers and parachuted down, and 12 mountain climbers managed to scale the Twin Towers' exteriors.
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The Twin Towers collapsed on September 11th, 2001 after jet airliners crashed into them.
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There were 2,192 civilians, 71 law enforcement officers, 343 firefighters, and 147 passengers on the planes that died in the attacks on 9/11 at Ground Zero (the Twin Towers' site).
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There were an estimated 3800 gold bars stored in the basement of the Twin Towers. They were worth an estimated $100 million.
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The Twin Towers housed approximately $100,000 worth of artwork at the time of their collapse.
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