This is the Dynamic Tower ( or known as Rotating Tower), located in Dubai, United Arab Emirates. It was designed by Italian architect David Fisher. The interesting point is also in its name: Rotating, this building has 80 floors and each floor can rotate independently from others. Besides, some parts of  this tower are pre-built at factories and then brought to construction location to merge together.
(Reference: http://en.wikipedia.org/wiki/Dynamic_Tower )