In 1938, Speer was assigned by Hitler himself to built the new Reichs Chancellery in Berlin. Speer promised the building to be completed within the year. A promise he kept.

Hitler decreed that the enormous new Reichs Chancellery should impress every visitor with its monumentality. "On the long corridor from the entrance to the reception hall, they'll learn something about the grandeur of the German Reich," Hitler said. The long corridor was to be 300 metres long, with a court of honour, a forecourt, a mosaic hall, a round hall, and a marble gallery along the way. Hitler's own office was 400 square metres in size. From the exterior, the chancellery has a stern, authoritarian appearance.

Honour Courtyard: From the Wilhelmplatz, visitors would enter the chancellery through the by four pillars dominated Honour Courtyard. At the far end the steps with the main entrance, flanked by two bronze statues by Arno Breker: Wehrmacht and Partei.

Mosaic Hall: The Mosaic Hall would be the first room visitors would see after entering the new Reichs Chancellery. The floor and walls were completely covered with red-stone marble: daylight entered the room through a large light dome in the roof.

Round Hall: When visitors had passed the impressive Mosaic Hall, the Round Hall would present them access to the even more impressive Marble Gallery. The Round Hall was covered by a large dome.

Marble Gallery: With 145 metres in length, twice as long as the Hall of Mirrors in the Palace of Versailles, the Marble Gallery was designed to impress visitors of the Reichs Chancellery.

Hitler's Office: Almost 400 metres in square, Hitler's office was completely designed by Speer himself - from the furniture to the windows. The distance from the doors of the room until Hitler's writing desk was 15 metres. The idea behind this, was that if visitors weren't yet impressed by the endless marble gallery, they would be paralyzed by despondency in the nearness of the Führer.