Source: YouTube/EarthCam

The 22-ton, 408-foot spire of New York City's 1 World Trade Center was hoisted to the top of the tower Thursday. Once the final piece is installed, 1WTC will become the tallest building in the Western Hemisphere at 1,776 feet. Still, resolution of a controversy surrounding the issue of the tower's exact height will depend upon whether the antenna, which is fitted with an LED beacon -- will be considered part of the tower's architectural height.

Related Summaries