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.
From the last-minute name change to the engineering feats involved in constructing the world's tallest building, the Burj Khalifa continues to generate a buzz.
The world's tallest buildings usually open when the economy has crashed, just like Monday's opening of the Burj Khalifa in Dubai.
Khalid Sheikh Mohammed and four others are to stand trial in New York. Here's the evidence federal prosecutors will use against them.