In Berlin's historical centre, the German Historical Museum (Deutsches Historisches Museum) is housed in two architecturally stunning buildings: the Zeughaus (Armoury) is the most important preserved Baroque building in Berlin, and I.M. Pei designed a highly modern building immediately behind it. The Chinese-American architect also designed the glass roof that protects the interior courtyard of the Zeughaus with its famous giant masks created by Andreas Schlüter.