Construction workers atop One World Trade Center Wednesday in New York City hoisted into place the first section of a spire that will extend the building to its full height of 1,776 feet.
It took crews about 45 minutes to lift the 16-foot section, weighing almost 70 tons, into place, The Daily Newsreported.
The full 408-foot spire, produced at a plant outside Montreal, is in 18 sections and will take three months to put in place.
Nine of the segments were delivered to the Ground Zero site by barge Tuesday from Port Newark, N.J., the Associated Press reported.
The building is already the tallest in New York City and once completed, will become the tallest building in the Western hemisphere and the third tallest in the world.