Keith Bedford / Reuters
Construction workers and guests watch as the final steel beam to be installed on 4 World Trade Center is raised during a ceremony in New York, June 25.
Spencer Platt / Getty Images
Construction workers sign the last steel beam before it is hoisted 977 feet to the top of Four World Trade Center on June 25, in New York City.
Andrew Gombert / EPA
The last steel beam is lifted to the top of 4 World Trade Center, June 25.
The final steel beam, signed by a group of construction workers was lifted by crane 977 feet in the air and placed atop 4 World Trade Center, which will be the first tower completed on the 16-acre World Trade Center site when it opens in the fall of 2013. Full story.
Mark Lennihan / AP
In a photo made Saturday, June 23, 2012, construction cranes perch on top of One World Trade Center, left, and Four World Trade Center in New York.