9/11 Timeline: The Attacks on the World Trade Center in New York City | History
Rise and Fall: The World Trade Center Premieres 9/10 at 8/7c on The HISTORY Channel
The Construction of One World Trade Center | History
Official 20 Year Time-Lapse - Rebuilding the World Trade Center
When the Towers Fell | National Geographic
The original World Trade Center was a large complex of seven buildings in the Financial District of Lower Manhattan, New York City, United States. It opened on April 4, 1973, and was destroyed in 2001 during the September 11 attacks. At the time of their completion, the Twin Towers—the original 1 World Trade Center at 1,368 feet (417 m); and 2 World Trade Center at 1,362 feet (415.1 m)—were the tallest buildings in the world. Other buildings in the complex included the Marriott World Trade Center, 4 WTC, 5 WTC, 6 WTC, and 7 WTC. The complex contained 13,400,000 square feet (1,240,000 m2) of office space.