Burj Khalifa

(credit: MARWAN NAAMANI/AFP/Getty Images)

French climber Alain Robert scales the 828 meter World's tallest tower Burj Khalifa in Dubai on March 28, 2011. French 'Spiderman' Robert is world famous for illegally climbing tall buildings across the world. AFP PHOTO / MARWAN NAAMANI

Burj Khalifa

(credit: MARWAN NAAMANI/AFP/Getty Images)

French climber Alain Robert scales the 828 meter World's tallest tower Burj Khalifa in Dubai on March 28, 2011. French 'Spiderman' Robert is world famous for illegally climbing tall buildings across the world. AFP PHOTO / MARWAN NAAMANI

Burj Khalifa

(credit: KARIM SAHIB/AFP/Getty Images)

Crowds look at fireworks bursting around Burj Khalifa, the tallest building in the world, marking the New Year at midnight on January 1, 2011 in the Gulf emirate of Dubai. AFP PHOTO/KARIM SAHIB

Burj Khalifa

(credit: MARWAN NAAMANI/AFP/Getty Images)

Burj Khalifa, the world tallest tower, is silhouetted at sunset in Dubai, on November 30, 2010. The construction and real estate sectors in Dubai has registered a near five percent fall in 2010, a top Dubai government official said, adding that the sector was hit hard by the financial crisis. AFP PHOTO/MARWAN NAAMANI

Burj Khalifa

(credit: MARWAN NAAMANI/AFP/Getty Images)

Burj Khalifa, the world tallest tower, is silhouetted at sunset in Dubai, on November 30, 2010. The construction and real estate sectors in Dubai has registered a near five percent fall in 2010, a top Dubai government official said of the sector was hit hard by the financial crisis. AFP PHOTO/MARWAN NAAMANI

Burj Khalifa

(credit: JOEL SAGET/AFP/Getty Images)

A picture taken on September 29, 2010 shows the Dubai's Burj Khalifa building, the world's tallest tower. AFP PHOTO / JOEL SAGET

Burj Khalifa

(credit: KARIM SAHIB/AFP/Getty Images)

Dubai's Burj Khalifa tower, the world's tallest skyscraper, is lit by laser lights during its opening ceremony in the Gulf emirate on January 4, 2010. Sheikh Mohammad bin Rashed al-Maktoum, the ruler of Dubai, officially opened the world's tallest building, which stands at 828 metres high. AFP PHOTO/KARIM SAHIB

Burj Khalifa

(credit: JOEL SAGET/AFP/Getty Images)

Tourists look at Dubai's Burj Khalifa (C), the world's tallest tower, on April 5, 2010. Dozens of visitors lined up to ascend the viewing deck of the glistening 160-storey tower, which reopened after an elevator breakdown forced its closure only a month after a glitzy inauguration in January 2010. Burj Khalifa's observatory reopened in the afternoon, after nearly a two-month closure that reportedly followed a February 6 incident when passengers were trapped in a malfunctioning elevator for 30 minutes. AFP PHOTO/KARIM SAHIB (Photo credit should read KARIM SAHIB/AFP/Getty Images)

Burj Khalifa

(credit: JOEL SAGET/AFP/Getty Images)

A Picture take on September 29, 2010 shows the Dubai's Burj Khalifa building, the world's tallest tower. AFP PHOTO / JOEL SAGET