It may not be as recognizable as the Louvre glass pyramid, but Berlin has its own glass and steel I.M. Pei museum addition which is stunning in its own right. Often viewed as one of the most important museums in Berlin, the German Historical Museum is devoted to German history. The adjacent Exhibition Hall was designed by Pei during a renovation of the façade.  Photo 10 of 12 in 10 I.M. Pei Buildings We Love