Speer's Monster-Building () was to be the capital's most important and impressive building in terms of its size and symbolism. Visually it was to have been the architectural centrepiece of Berlin as the world capital (Welthauptstadt). Its dimensions were so large that it would have dwarfed every other structure in Berlin, including those on the north-south axis itself. The oculus of the building's dome, in diameter, would have accommodated the entire rotunda of Hadrian's Pantheon and the dome of St. Peter's Basilica. The dome of the Volkshalle was to rise from a massive granite podium and high, to a total inclusive height of . The diameter of the dome, , was to be exceeded, much to Speer's annoyance, by the diameter of Giesler's new domed railway station at the east end of Munich's east-west axis. It was to be greater in diameter than Speer's Volkshalle.