The spire for the top of One World Trade Center is hoisted into place at the top of the building in New York City, on May 10, 2013. The spire has been put in place on One World Trade Center bringing the iconic structure to its full, symbolic height of 1776 feet.

WTC worker Tyler Brown taking in the view after the spire has been installed at the top of One World Trade Center.

The final piece of spire is hoisted in place on top of One World Trade Center, on May 10, 2013 in New York. The addition of the spire, and its raising of the building's height to 1,776 feet, would make One World Trade Center the tallest structure in the U.S. and third-tallest in the world.

Iron workers look at names signed inside of the final piece of the spire on top of the One World Trade Center in New York on May 10, 2013. Workers cheered and whistled as they completed the spire on New York's One World Trade Center on Friday, raising the building to its full height of 1,776 feet and helping fill a void in the skyline left by the September 11, 2001 attacks.

An iron worker takes a photograph of a crane as it places the final piece of the spire on top of the One World Trade Center in New York on May 10, 2013.

The skyline of Manhattan from the top of One World Trade Center on May 10, 2013.

The spire for the top of One World Trade Center is hoisted into place at the top of the building in New York, on May 10, 2013. The State of Liberty is seen bottom right.

A woman admires the view from the 69th floor of The Shard skyscraper on the preview day to mark the sale of tickets for the 'View from The Shard' experience on Oct. 26, in London, England. The observation floors of The Shard skyscraper offer 360 degree aspect of London, and at 244m they are twice the height of any other viewing platform in the city. The 'View from The Shard' opens to the general public on February 1, 2013 and costs 24.95 GBP for adults.

Russia's members of Emergency Situation Ministry and Interior Ministry officers work at the site of a damaged nine-storey building in Russia's southern city of Astrakhan on Monday. The building collapsed after a household gas explosion, injuring 12 people according to preliminary information released by local media.

Rescuers inspect debris of an apartment building after an explosion on Monday.

MD Anderson's Houston Main Building is imploded Jan. 8, in Houston, Texas. Opened in 1952, the 20-story building was the regional headquarters for Prudential Insurance Company. Prudential sold the building in 1975.

Construction workers complete work on the roof of the Singapore ArtScience Museum on February 8, 2011 at Marina Bay Sands, Singapore. Designed by renowned architect Moshe Safdie, the 50,000 sqft, lotus- inspired building, is the worlds first ArtScience Museum and will house 21 galleries. The large roof dish collects rain water which falls through the center atrium of the building as a waterfall, at night the roof then transforms into an amphitheatre displaying a light and laser show with the Singapore skyline as a backdrop. The museum is set to open to the public on the 17th of February at 1.18 pm, the time chosen by the projects Feng Shui master.

Construction workers complete work on the roof of the Singapore ArtScience Museum on February 8, 2011 at Marina Bay Sands, Singapore. Designed by renowned architect Moshe Safdie, the 50,000 sqft, lotus- inspired building, is the worlds first ArtScience Museum and will house 21 galleries. The large roof dish collects rain water which falls through the center atrium of the building as a waterfall, at night the roof then transforms into an amphitheatre displaying a light and laser show with the Singapore skyline as a backdrop. The museum is set to open to the public on the 17th of February at 1.18 pm, the time chosen by the projects Feng Shui master.

Tourists take photographs as construction workers complete work on the roof of the Singapore ArtScience Museum on February 8, 2011 at Marina Bay Sands, Singapore. Designed by renowned architect Moshe Safdie, the 50,000 sqft, lotus- inspired building, is the worlds first ArtScience Museum and will house 21 galleries. The large roof dish collects rain water which falls through the center atrium of the building as a waterfall, at night the roof then transforms into an amphitheatre displaying a light and laser show with the Singapore skyline as a backdrop. The museum is set to open to the public on the 17th of February at 1.18 pm, the time chosen by the projects Feng Shui master. (Photo by Chris McGrath/Getty Images)

Firefighters try to extinguish a fire at a building in Shanghai, on November 15, 2010.