A view of Tokyo Skytree, the world's tallest broadcasting tower at 634 meters (2080 feet), in Tokyo on May 21, 2012. The tower opened to the public on May 22, with hundreds of people entering the tower and its large shopping mall. Kyodo/Reuters
The ceremonial last beam is hoisted to the top of Four World Trade Center, Monday, June 25, 2012. 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 9/11 attacks. Mark Lennihan/AP
One World Trade Center, the giant monolith being built to replace the twin towers destroyed in the Sept. 11 attacks, will lay claim to the title of New York City’s tallest skyscraper on Monday, April 30 as workers erect steel columns that will make its unfinished skeleton a little over 1,250 feet, just high enough to peak over the observation deck on the Empire State Building. Mark Lennihan/AP
An ironworker connects a steel plate to a column at One World Trade Center in New York, or “Freedom Tower”, in December 2010. The Empire State Building is visible in the rear upper left. Mark Lennihan/AP
A BASE jumper freefalls after jumping from the Jinmao Tower in Shanghai, Chgina on October 5, 2004. Reuters
The Jinmao Building in Shanghai, China, is 1,381 feet tall and was built in 1999. Reuters
At 2,073 feet the Shanghai Tower in China, just completed, is the world’s second tallest building. A Chinese billionaire wants his Sky City to soar even higher. AP
A crane lifts a section of steel onto the top of the Shard building in central London, March 30, 2012. The final section of steel meant the Shard reached its full height of 1,017 feet, making it the tallest building in Europe. Toby Melville/Reuters
The Chrysler Building (r.), and The Empire State Building (l.), in New York. The Chrysler Building was New York's tallest from 1930-31, until the completion of the Empire State Building. Richard Drew/AP
A woman has her picture taken in New York's Top of the Rock Observation Deck at Rockefeller Center, May 10, 2013. The 1,454-foot Empire State Building, and the 1,776-foot One World Trade can be seen in the background. Richard Drew/AP
The 1,260 ft tall skyscraper at Shun Hing Square in the southern Chinese city of Shenzhen in Guangdong province, China, was finished in 1996.
. Bobby Yip/Reuters
The Burj Khalifa in Dubai, United Arab Emirates, is the tallest building in the world. Completed in 2010, it stands 2,717 feet high. Ahmed Jadallah/Reuters
Standing 1,670 feet tall, the Taipei 101 Tower in Taipei, Taiwan was built in 2004. Wally Santana/AP
Completed in 1998, the Petronas Towers in Kuala Lumpur, Malaysia, stands 1,483 feet tall. Bazuki Muhammad/Reuters
A girl looks down from "The Ledge", series of glass bays that jut out from the 103rd floor at Willis Tower (formerly the Sears tower) in Chicago on July 2009. Kiichiro Sato/AP
On July 16, 2009, Sears Tower, the tallest building in the Western Hemisphere, was renamed Willis Tower after Willis Group, the global insurance broker, in a changing of the guard that underscores Chicago's increasing importance as a major global financial and business center. The Willis Tower is 1,450 feet high and was built in 1974. Business Wire/File
Finished in 2003, Hong Kong's Two International Finance Centre is 1,362 feet tall. Vincent Yu/AP
The simple and elegant 4 World Trade Center is the first skyscraper to open at ground zero. Even with 40 percent of its office space to fill, the structure was hailed as symbolizing New York's resilience and growth.
Gleaming with "quiet dignity" on a bright November morning, 978-foot-high 4 World Trade Center opened its doors Wednesday, the first skyscraper to open on the original site of the iconic Twin Towers since their destruction 12 years ago. It was a symbolic moment for New York’s “ground zero” after more than a decade of painstaking construction that reshaped Manhattan’s southern tip – and perhaps its psyche, too.