Final steel beam lifted at 4 World Trade Center
4 World Trade Center
Ironworkers attend the topping out ceremony at Four World Trade Center, Monday, June 25, 2012 in New York. The 72-floor, 977-foot tower is scheduled to open late next year. It's expected to be the first tower completed on the 16-acre site since the Sept. 11, 2001, terrorist attacks. (AP Photo/Mark Lennihan)






