One World Trade Center reaches full height

The silver spire topping One World Trade Center is lifted as it is fully installed on the building's roof, bringing the structure to its full, symbolic height of 1,776 feet, May 10, 2013. The 408-foot spire, weighing 758 tons, will serve as a world-class broadcast antenna.

One World Trade Center stands at its full height above the New York City skyline in this view from the Heights neighborhood of Jersey City, N.J., May 10, 2013.

The final piece of spire is hoisted to the roof of One World Trade Center in New York, May 2, 2013.

Ironworkers will install the sections at a later date and when complete, One World Trade Center will stand 1,776 feet high, making it the tallest building in the Western Hemisphere.

The final piece of spire is hoisted to the roof of One World Trade Center in New York, May 2, 2013.

Construction workers watch as the final sections of the spire is raised to the top of One World Trade Center in New York, May 2, 2013.

The final section of the spire is raised to the top of One World Trade Center in New York, May 2, 2013.

It will be attached to a temporary work platform atop the structure. Ironworkers will install the sections at a later date.

Construction workers watch as the final sections of the spire is raised to the top of One World Trade Center in New York, May 2, 2013.

An iron worker holds a rope as the 408-foot spire is hoisted onto a temporary platform on the top of One World Trade Center in New York on May 2, 2013.

Workers fit supports to the final two sections of a 408-foot spire that will be hoisted to a temporary platform on the top of One World Trade Center in New York on May 2, 2013.

People watch as the final sections of the spire is raised to the top of One World Trade Center in New York on May 2, 2013.

A worker holds a guide rope as the final piece of spire is hoisted to the roof of One World Trade Center in New York on May 2, 2013.

The 408-foot spire is viewed as it is hoisted onto a temporary platform on the top of One World Trade Center in New York on May 2, 2013.

A 408-foot spire is lifted toward the top of the construction of One World Trade Center in New York, seen from the Heights neighborhood of Jersey City, N.J., Thursday, May 2, 2013.

The top piece of the 408-foot spire for One World Trade Center is lifted to the top of the building in New York, May 2, 2013.

The top piece of the 408-foot spire for One World Trade Center is lifted to the top of the building in New York on May 2, 2013.

Workers attach a harness to the final piece of spire before it is hoisted to the roof of One World Trade Center in New York on May 2, 2013.

The top piece of the 408-foot spire for One World Trade Center in New York is lifted to the top of the building on May 2, 2013.

A close-up of the top piece of the 408-foot spire for One World Trade Center is shown at ground level in New York, May 1, 2013.

Construction workers watch as the final piece of spire is hoisted to the roof of One World Trade Center, New York on May 2, 2013.

The top piece of the 408-foot spire for One World Trade Center in New York is shown at ground level, May 1, 2013.

Workers attach a harness to the final piece of spire before it is hoisted to the roof of One World Trade Center in New York on May 2, 2013.

A worker holds a guide rope as the final piece of spire is hoisted to the roof of One World Trade Center in New York on May 2, 2013.

Ironworker Tommy Hickey holds a guide rope as the final piece of spire is hoisted to the roof of One World Trade Center in New York on May 2, 2013.

Pelley_andPort_Authority_check_out_1_WTC_view_042513.jpg — CBS News

"CBS Evening News" anchor Scott Pelley and leaders of the Port Authority of New York and New Jersey look north from the roof of One World Trade Center on April 25, 2013.

"CBS Evening News" anchor Scott Pelley signs a steel beam on the roof of One World Trade Center on April 25, 2013.