Tiananmen means "the gate of heavenly peace" (characters: heaven - peace - gate). It's been a center for revolution, protest, and political upheaval for nearly as long as it has existed. It was the physical center of the May Fourth Movement. On October 1, 1949, it was the site of Mao's official declaration of the founding of the People's Republic of China. Later, it hosted the rallies that started off the Cultural Revolution. So it was naturally the logical choice for the Hu Yaobang/democracy demonstrations of 1989. The Square also holds Mao's mausoleum.

In 1999, the square was unusually closed for months surrounding the ten-year anniversary of June 4, 1989. Supposedly, this was to prepare for the massive celebrations surrounding the 50th anniversary of the PRC.

It is the world's largest public square.