WTC 1, known as "the north tower" is located geographically north of WTC 2, or "the south tower" (see map).
Built in the 1970s, World Trade Center Twin Towers in New York City were designed to withstand normal fires and hurricane-force winds. According to some reports, engineers believed that even the impact of a Boeing 707 would not bring down the towers.
But no engineer could have prepared for the destruction caused on September 11, 2001 when terrorists hijacked two passenger jets, each much larger than a Boeing 707, and slammed them into the World Trade Center Towers.
Learn More About September 11, 2001:
NEXT: The North Tower is Hit >>