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~ The World Trade Center had two 110-story buildings, known as the"Twin Towers" and five smaller buildings.

~ Tower One was 1,368 feet (414 meters) tall

~ Tower Two was 1,362 feet (412 meters) tall

~ The Twin Towers were the tallest until the Sears Tower surpassed them.

~ Architects: Minoru Yamaski & Associates and Emery, Roth & Sons.

~ Built of aluminum and steel.

~ The foundation of each tower extended more than 70 feet below ground, resting on solid bedrock.

~ Constructed on six acres of landfill.

~ The towers were the best known examples of"tube buildings," which are strenghtened by closely spaced columns and beams in the outer walls.

~ Each tower consisted of 104 passenger elevators and 21,800 windows.

~ About 50,000 people worked in the complex, which housed the offices of more than 430 businesses from 26 countries.

~ Completed in 1970.

~ Automatic window-washing machines cleaned 600,000 square feet of glass.

Source: World Trade Center and PBS </ul>



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