Arch @ Shanghai World Financial Center, Shanghai

Kohn Pedersen Fox Architects. Under construction, completion scheduled for 2008

Rising in the Lujiazhui financial district in Pudong, the Shanghai World Financial Center is a tower among towers. The elegant 101-story skyscraper will be (for a moment, at least) the world's tallest when completed in early 2008.

One of the biggest challenges of building tall is creating a structure that can withstand high winds. The architects devised an innovation solution to alleviate wind pressure by adding a rectangular cut-out at the building's apex. Not only does the open area help reduce the building's sway but it also will be home to the world's highest outdoor observation deck -- a 100th-floor vista that will take vertigo to new heights.

@Reena Jana + businessweek.com