8. 3 WTC is the First Building in the World to have an Annealed Glass Exterior

3 WTC will be built with 10,000 annealed glass panels, meaning when the glass is is cooled slowly to reduce internal stress. It’s particularly important for security reasons, as annealed glass won’t break into shards when broken. 3 WTC will be the first skyscraper built with this type of glass.