- Tower One was 1,368 feet (414 meters) tall
- Tower Two was 1,362 feet (412 meters) tall
- Each World Trade Center tower was 64 m square
- Each World Trade Center tower stood 411 m above street level
- The World Trade Center towers rested on solid bedrock and the foundations extended 21 m below grade
- The World Trade Center towers had a height-to-width ratio of 6.8.
- The World Trade Center tower facades were constructed of aluminum and steel lattice
- Each World Trade Center tower used a lightweight tube construction with 244 closely spaced columns on the outer walls
- A 80 cm tall web joist connected the core to the perimeter at each floor
- Concrete slabs were poured over the web joists to form the floors
- There were no interior columns in the World Trade Center tower office spaces
- Each World Trade Center tower contained 104 passenger elevators
- Each World Trade Center tower had 21,800 windows
- Each World Trade Center tower weighed about 500,000 tons
- About 50,000 people worked in the World Trade Center complex
After the September 11 terrorist attacks, two trident (3-pronged) columns from the Twin Towers were salvaged from the ruins to be incorporated into the design of the National 9/11 Museum at Ground Zero.
Architects also paid homage to the the lost Twin Towers by giving the new skyscraper, One World Trade Center ("Freedom Tower"), similar dimensions. Measuring 200 feet square, the footprint of One World Trade Center matches each of the Twin Towers. Excepting for the spire, One World Trade Center is 1,368 feet tall, like Tower One. If you also exclude the parapet, One World Trade Center is 1,362 feet tall, like Tower Two.