Sentence:  The twin towers of the <WSD>World Trade Center</WSD> soared so majestically over the Manhattan skyline that, from the pavement below, it was hard to believe that the writhing shapes falling from the upper storeys were office workers who had jumped to escape the flames. 
Meaning of the word marked with <WSD> tags:  A complex of buildings in New York City, three of which were destroyed in the 9/11 attacks.