premise: The World Trade Center featured landmark twin boys.
hypothesis: 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 .