The World Trade Center (History's Great Structures)

New York City's World Trade Center, which included the buildings known as the Twin Towers, was one of the citys most familiar structures. But its legacy rests on one of the modern worlds greatest tragedies: the terrorist attacks of September 11, 2001, in which hijacked airliners crashed into the towers, causing them to collapse and claiming the lives of more than 2,700 people.

The worlds greatest structures were all built through some combination of human ingenuity, perseverance, vision, will power and, in many cases, physical might. Historys Great Structures examines the practical, technological, and political challenges encountered by the designers and builders; how these structures were used by the people of the time; and what has become of them today