premise: The World Trade Center featured landmark triplet towers.
hypothesis: The Twin Towers II ( also known as Twin Towers 2 and New Twin Towers , Trump Twin Towers and World Trade Center Phoenix ) was a proposed twin-towered supertall skyscraper complex which would have been located at the World Trade Center site in Manhattan , New York City . World Trade Center (1973–2001) . 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 .