One of the famous parts of the building is the hexadecagonal (sixteen-sided) central hall, with huge chambers adjoining it: the Lower House and the Upper House. The modern National Assembly is unicameral and meets in the Lower House, while the Upper House is used as a conference and meeting room. The Holy Crown of Hungary, which is also depicted in the coat of arms of Hungary, has been displayed in the central hall since 2000. Due to its extensive surface and detailed handiwork, the building is almost always under renovation.