Spire lifted to the top of One World Trade Center Pictures Spire lifted to the top of One World Trade Center The final piece of spire is hoisted to the roof of One World Trade Center in New York, May 2, 2013. Ironworkers will install the sections at a later date and when complete, One World Trade Center will stand 1,776 feet high, making it the tallest building in the Western Hemisphere. Credit: Mark Lennihan/AP