World Trade Center construction and tribute / 15th anniversary of 9/11 (Clip E08/E11)


When the towers were finished each one would have 97 passenger elevators capable of carrying loads of up to 10,000 pounds at speeds up to 1,600 feet per minute In all, the towers were assembled from more than 200,000 pieces of steel manufactured around the country 3,000 miles of electrical wiring 425,000 cubic yards of concrete 40,000 doors 43,600 windows and six acres of marble

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