Building One World Trade Center

A crane lifts a second iron column into place on the 100th story of One World Trade Center in New York. LUCAS JACKSON/REUTERS

The Empire State Building is seen behind an iron worker as he stands next to protective netting on the 100th story of One World Trade Center in New York. LUCAS JACKSON/REUTERS

Iron workers walk around the steel decking on the 100th story of One World Trade Center in New York. LUCAS JACKSON/REUTERS

An iron worker sits to eat on a partially finished floor near the top of One World Trade Center in New York. LUCAS JACKSON/REUTERS

Iron worker Steven Cross carries steel cable across the 100th story of One World Trade Center in New York. LUCAS JACKSON/REUTERS

A view shows the One World Trade Center in New York. ANDREW BURTON/REUTERS

A view shows the One World Trade Center in New York. ANDREW BURTON/REUTERS

A couple, posing for their pre-wedding photographs, are back-dropped by the One World Trade Center and Manhattan skyline as seen from New Jersey. EDUARDO MUNOZ/REUTERS

A construction worker sweeps the 71st floor of One World Trade Center in New York. ANDREW BURTON/REUTERS

One World Trade Center is seen from Battery Park in New York. ANDREW BURTON/REUTERS

One World Trade Center is seen from Battery Park in New York. ANDREW BURTON/REUTERS

Iron workers put their tools back into storage bins on the 100th story of One World Trade Center in New York. LUCAS JACKSON/REUTERS

Iron worker Steven Cross steadies an iron beam on the 100th story of One World Trade Center in New York. LUCAS JACKSON/REUTERS

The Empire State Building and lower Manhattan is seen from the 90th story of One World Trade Center in New York. LUCAS JACKSON/REUTERS

Iron workers Steven Cross (L) and Adam Cross prepare steel cables to lift iron beams on the 100th story of One World Trade Center in New York. LUCAS JACKSON/REUTERS

Iron worker climbs a column to help manoeuvre a beam on the 100th story of One World Trade Center in New York. LUCAS JACKSON/REUTERS

An iron worker walks on a walkway that hangs on the outside of the 100th story of One World Trade Center in New York. LUCAS JACKSON/REUTERS

Iron workers talk with each other as they wait for a column to be placed on the 100th story of One World Trade Center in New York. LUCAS JACKSON/REUTERS

An iron worker pulls tubing onto his shoulder as he works on the 100th story of One World Trade Center in New York. LUCAS JACKSON/REUTERS

An iron worker looks down from a partially finished floor near the top of One World Trade Center in New York. LUCAS JACKSON/REUTERS

An iron worker rubs his eyes as he sits for a rest on a partially finished floor near the top of One World Trade Center in New York. LUCAS JACKSON/REUTERS

An iron worker sits to rest on a partially finished floor near the top of One World Trade Center in New York. LUCAS JACKSON/REUTERS

Iron workers gather to rest on a partially finished floor near the top of One World Trade Center in New York. LUCAS JACKSON/REUTERS

Iron workers Billy Geoghan and Jim Brady place an iron beam on the 100th story of One World Trade Center in New York. LUCAS JACKSON/REUTERS

The 9/11 Memorial can be seen from the 90th story of One World Trade Center in New York. LUCAS JACKSON/REUTERS

Attendees of the 9/11 Memorial are seen from the 90th story of One World Trade Center in New York. LUCAS JACKSON/REUTERS

The Empire State Building and lower Manhattan is seen from the 90th story of One World Trade Center in New York. LUCAS JACKSON/REUTERS

The Brooklyn Bridge and Manhattan Bridge is seen from the 90th story of One World Trade Center in New York. LUCAS JACKSON/REUTERS

One World Trade Center is seen from Battery Park in New York. ANDREW BURTON/REUTERS