One World Trade Center Tallest Building in U.S.

On Friday, May 10, workers finished installing the spire atop One World Trade Center, making it officially the tallest building in the United States at a symbolic 1,776 feet. The spire itself is 408 feet tall. The Associated Press reported that the spire, when finished and active, will serve as a broadcast antenna and keep aircraft away with powerful red LED lights that can be seen from miles away. The tower now stands taller than the Twin Towers that collapsed as a result of the 9/11 terrorist attacks.