Original: Mitte encompasses Berlin 's historic core and includes some of the most important tourist sites of Berlin ( like the Museum Island , Brandenburg Gate , Unter den Linden and the Reichstag among others ) , most of which were in former East Berlin .
Simplified: Some of the most important tourist sites of Berlin ( like the Pergamon Museum , Brandenburg Gate , Charité and the Reichstag ) , are all in Mitte , and most were in East Berlin .