Friedrichshain ( German pronunciation ) is a district of the Friedrichshain-Kreuzberg borough in Berlin, Germany. From its creation in 1920 until 2001, it was a freestanding city borough. Formerly part of East Berlin, it is adjacent to Mitte, Prenzlauer Berg, Kreuzberg and Lichtenberg. Friedrichshain is named after the Volkspark Friedrichshain, a vast green park at the northern border with Prenzlauer Berg. In the Nazi era, the borough was called Horst-Wessel-Stadt. Friedrichshain is one of the trendy districts of Berlin and has experienced gentrification.