A part of the spire that will top off One World Trade Center was installed Tuesday morning.
Workers using two giant cranes on the 104th floor roof installed the first piece of the spire that will make it the tallest building in the Western Hemisphere.
The 70-ton piece was brought to the building last month. Dozens of construction workers were on hand Tuesday as the massive, round piece of steel slowly descended into its socket.
Copyright AP - Associated Press
