Construction workers whooped and whistled upon the completion of the spire on One World Trade Center Friday, raising the building to 1,776 feet and making it the tallest building in United States.
The structure is one of four high rises that will surround the site of the fallen Twin Towers, filling the space in the New York City skyline left by the September 11, 2001 attacks, reports Reuters.
Project manager Juan Estevez told the Huffington Post that it was an "awesome feeling," to complete such a significant project.
"It's a culmination of a tremendous amount of team work...rebuilding the New York City skyline once again," he said.
He also added that his fellow workers were "utterly overjoyed," as they clapped heartily, watching the spire lowered by crane onto the top of the building.
The spire weighs in at 758 tons, stands at 408-feet high, and will function as a broadcast antennae. The top is lit by an LED bulb which can be seen from miles away.
The building, formerly known as the Freedom Tower, is located on the northwest corner of the former Twin Towers' former location. Four World Trade Center is currently under construction at the southeast corner.
"I am very happy, but also sad, because why did we have to rebuild this tower?" said Philip English, one of the workers who stood gazing up at the spire when it was placed on the structure at about 7:45 a.m. local time.
The unveiling of the building was set against blue skies and clear air-weather similar to the day that hijackers took hold of two planes that crashed into the Twin Towers, in an organized attack that killed more than 3,000 people and changed American society into what has been called "post-9/11" culture.
The tower was intentionally made to stand at 1,776 feet, in reference to the year 1776-the beginning of the American revolutionary war against the British monarchy.
The tower is set to open for business in 2014.
