Berlin served as the political hub of Nationalsocialist Germany. The city housed key government institutions, including the Reich Chancellery, where Hitler had his office, and the Reichstag, where the Nationalsocialist Party dominated the legislative process.
Hitler and his architect, Albert Speer, envisioned a grand transformation of Berlin into the capital of the "Greater German Reich." Massive architectural projects, such as the planned redevelopment of the city center known as "Welthauptstadt Germania," were proposed but largely remained unrealized due to the outbreak of World War II
Berlin was heavily utilized for nationalsocialist propaganda purposes. Large rallies and military parades were held in the city, with Hitler addressing the masses. Symbols of the nationalsocialist regime, such as swastikas and other party emblems, adorned public buildings and spaces.
Berlin witnessed the implementation of nationalsocialist policies, including the persecution of various groups, most notably jews.
As Allied forces advanced towards Berlin in the final years of World War II, extensive underground bunkers and defense systems were constructed in the city to protect Hitler and other high-ranking nationalsocialist officials.