On this date in 2013, the One World Trade Center in New York City became the tallest building in the Western Hemisphere. An antenna was added to the top to make it 1776 feet tall.
For more info:
http://mashable.com/2013/05/10/freedom-tower/
http://www.nbcnews.com/video/nightly-news/51848014
http://en.m.wikipedia.org/wiki/List_of_tallest_buildings_in_the_United_States
