Abuja's Central District, also called Central Area, is a strip of land stretching from Aso Rock in the east to the National stadium and the Old City gate in the West.It is like the city's spinal cord, dividing it into the northern sector with Maitama and Wuse, and the southern sector with Garki and Asokoro. While each district has its own clearly demarcated commercial and residential sectors, the Central District is the city's principal Business Zone, where practically all parastatals and multinational corporations have their offices. An attractive area in the Central District is the region known as the Three Arms Zone, so called because it houses the administrative offices of the executive, legislative and judicial arms of the federal government. A few of the other sites worth seeing in the area are the federal secretariats alongside Shehu Shagari Way, Aso Hill, the Abuja Plant Nursery, Eagle Square (which has important historic significance, as it was in this grounds that the present democratic dispensation had its origin on 29 May 1999) and in which all subsequent Presidential Inauguration ceremonies have taken place. The Tomb of the Unknown Soldier is situated across Shehu Shagari Way facing the Eagle Square. This section is usually closed to traffic during the annual Armed Forces Remembrance Day ceremonies that is observed on 15 January. The National Mosque and National Church of Nigeria are opposite each other on either side of Independence Avenue. A well-known government office is the Ministry of Defense, colloquially nicknamed Ship House. Also located here is the yet-to-be-completed National Square, Millennium tower and Nigeria Cultural Centre multi-functional complex.