Workers pour the concrete roof of One World Trade Center, Tuesday, Dec. 11, 2012 in New York. Behind them is the steel superstructure that will support a 408-foot spire that is expected

 

              Workers pour the concrete roof of One World Trade Center, Tuesday, Dec. 11, 2012 in New York. Behind them is the steel superstructure that will support a 408-foot spire that is expected
Workers pour the concrete roof of One World Trade Center, Tuesday, Dec. 11, 2012 in New York. Behind them is the steel superstructure that will support a 408-foot spire that is expected to rise into the Manhattan sky by spring. (AP Photo/Mark Lennihan)
Tags: Trade , NeW , WORLD