Twin Towers , Remembering Sept. 11: Construction of the original World Trade Center started in 1969 and the seven-building complex, including the twin towers, opened on April 4, 1973 in lower Manhattan. At that time, the towers were the tallest buildings in the world, surpassing the Empire State Building.

Twin Towers

Remembering Sept. 11: Construction of the original World Trade Center started in 1969 and the seven-building complex, including the twin towers, opened on April 4, 1973 in lower Manhattan. At that time, the towers were the tallest buildings in the world, surpassing the Empire State Building.

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