The Tiananmen Gate at the north of the Tiananmen Square is facing south, as prescribed by traditional Chinese architecture and city layout according to which not only the Forbidden City but all of Beijing is set up.
Since Empire times until today the Tiananmen Gate is a crucial location. During the Empire it was used for the proclamation of literati candidates who succeeded in obtaining the highest ranking in the civil exams and who came in direct service to the emperor who had the 天命 Mandate of Heaven. With lots of ceremony their names were proclaimed from this gate.
In the beginning of the twentieth century the 五四运动 May Four Movement took place at the bottom of this gate. The May Four Movement 1919 was symbol of the emancipation movement China was going through at the time. Chinese society changed drastically during that period. (Many people see the changes of today's China since the opening up in 1978 as a continuation of what started then).
On October 1, 1949 Mao Zedong proclaimed the establishment of the People's Republic of China from this place. Until today his picture remains on the gate. Mao Zedong gained his place in Chinese history mainly because he was the one who reunited China after the 'century of humiliation' the West brought to China starting with the Opium War in 1840 and ending in 1949.
On special days like October 1st, the picture of Sun Yat-sen, founder of the Chinese Republic in 1911, is also brought out onto the Tiananmen Square, facing Mao Zedong's picture. This place is really the very heart of China.
At regular times in history this place witnesses demonstrations and revolts. In recent history there was the demonstration after the death of Zhou Enlai in 1976 and the demonstration after the death of Hu Yaobang in 1989.