** FILE ** Fountains operate in front of the Burj Khalifa, the world's tallest building, in Dubai, United Arab Emirates, in 2010. (AP Photo/Kamran Jebreili)

Photo by: Kamran Jebreili

** FILE ** Fountains operate in front of the Burj Khalifa, the world's tallest building, in Dubai, United Arab Emirates, in 2010. (AP Photo/Kamran Jebreili)