Thirteen years after the twin towers of the World Trade Center were destroyed in the Sept. 11 terrorist attacks, the rebuilt One World Trade Center building opens its doors to workers.
The new structure cost $3.9 billion to build and, at 104 stories, is the tallest building in the United States.
Here are pictures of the scene at the center as its first new tenants begin moving in.
—By CNBC staff.
Posted Nov. 3, 2014.