The World Trade Center featured one building.
One World Trade Center ( also known as 1 World Trade Center , 1 WTC or Freedom Tower ) is the main building of the rebuilt World Trade Center complex in Lower Manhattan , New York City . The World Trade Center was a large complex of seven buildings in Lower Manhattan , New York City , United States . It featured landmark twin towers , which opened on April 4 , 1973 , and were destroyed as a result of the September 11 attacks . World Trade Center (2001–present) . The original World Trade Center featured the landmark Twin Towers , which opened in 1973 , and were the tallest buildings in the world at their completion . The new complex includes One World Trade Center , 7 World Trade Center , three other high-rise office buildings , a museum and memorial , and a transportation hub similar in size to Grand Central Terminal .