Tiananmen or "Gate of Heavenly Peace“ is a national symbol in Beijing. It was built during the Ming Dynasty in 1420 and it is often referred to as the front entrance to the Forbidden City. It has been destroyed and rebuilt several times. The building is 66 metres long, 37 metres wide and 32 metres high. Like other official buildings of the empire, the gate has unique imperial roof decorations. Tiananmen Square has been the site of a number of political events such as the proclamation of the People's Republic of China by Mao Zedong in October 1, 1949 and for mass rallies during the Cultural Revolution. Tiananmen is located along the northern edge of Tiananmen Square.