组图：世界十佳摩天大楼

4. Cayan Tower, Dubai, UAE This building's twisted shape reduces wind forces on the tower. Each floor is rotated by 1.2 degrees to achieve the full 90-degree spiral, creating the shape of a helix. Used mainly as residential property, it is the world's tallest tower featuring a 90-degree twist.

第四名：阿联酋迪拜卡延塔。此建筑的螺旋设计减小风的阻力。每层旋转1.2度，最终达到90度的螺旋。主要是住宅地产，它是世界最高楼，以其90度螺旋而著名。