Skyscrapers around the world

An aerial view of Burj Dubai is seen in Dubai December 21, 2009. Dubai World disappointed creditors on Monday by making little progress on securing standstill on $22 billion of debt, as a key creditor meeting turned out to be a tame affair with less than half the expected attendees showing up. Picture taken December 21, 2009. REUTERS/Matthias Seifert (UNITED ARAB EMIRATES - Tags: CITYSCAPE BUSINESS)

This general view from \"The Peak\" shows Hong Kong's latest addition to its skyline, the newly completed 88-storey Two IFC building (C), towering above the city, 12 July 2003. Two IFC, which is the third tallest building in the world behind the Sears Tower in Chicago and the Petronas Towers in Kuala Lumpur, is expected to open for business in a month. AFP PHOTO/Richard A. BROOKS (Photo credit should read RICHARD A. BROOKS/AFP/Getty Images)

Clouds of rain brought by typhoon Saomai linger over the city as the Taipei 101, the highest building in the world stands out, Thursday, Aug. 10, 2006, in Taipei, Taiwan. The Central Weather Bureau issued a land warning for Saomai in the island's north, including the capital, Taipei. No major damage or casualties were reported, the government's interagency emergency center said. Saomai is the Vietnamese name for the planet Venus. (AP Photo)

KUALA LUMPUR, MALAYSIA - FEBRUARY 27, 2009: A view of the Petronas Towers at night in Kuala Lumpur, Malaysia. (Photo by Andrea Pistolesi/Getty Images)

SHANGHAI, CHINA - NOVEMBER 19: An elevated view shows Jin Mao Building (front) and Oriental Pearl Television Tower standing in front of the Huangpu River at Pudong financial district on November 19, 2008 in Shanghai, China. Shanghai, mainland China's financial center and a showpiece of the world's fastest growing economy, is bracing itself for the global financial tsunami. (Photo by Andrew Wong/Getty Images)

The Chicago skyline featuring the Sears Tower is seen from a helicopter 06 July 2006 in Chicago, Illinois. The tower, the tallest in North America was the tallest in the world until 1996. The tower is third behind the Petronas Towers in Malaysia. AFP PHOTO/TIM SLOAN (Photo credit should read TIM SLOAN/AFP/Getty Images)

17 Oct 2009, Shanghai, China --- The Shanghai World Financial Center in Pudong, Shanghai. Designed by Kohn Pedersen Fox, the 101-story tower opened to the public in August 2008 and is currently the 2nd tallest building in the world. --- Image by © James Leynse/Corbis

GUANGZHOU, CHINA - AUGUST 28: (CHINA OUT) A view of the Guangzhou TV Tower is seen under construction on August 28, 2008 in Guangzhou of Guangdong Province, China. When finished in 2009, it will reach a height of 610 meters (about 2,000 feet). (Photo by China Photos/Getty Images)

NEW YORK - JUNE 23: The Empire State Building is seen before the Mishka concert at the 3rd Annual OpenA.I.R: Artist in Residence Summer Concert Series hosted by Gotham Organization at Atlas New York on June 23, 2009 in New York City. (Photo by Rob Loud/Getty Images for Gotham Organization)