NEW YORK (CBSNewYork) - While the top of the spire was installed at One World Trade Center a couple of weeks ago, there are still other pieces to install.
That means workers have had to scale the mast to attach them.
The construction of the tower has been well-documented and, on Friday, the Port Authority tweeted out a photo of workers 1,700 feet up.
Click the image below to see it full size. You can follow the progress of the World Trade Center via @WTCProgress.
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