Large enough to hold 1 million people, the 440,000-square-metre Tian'anmen Square in the center of Beijing is the world's largest city square, where sunrises and sunsets are observed solemnly with national flag hoisting and lowering ceremonies. Tian'an men Gate on the northern edge of the square sued to be the front gate of the Ming and Qing Imperial Palace. The rostrum atop the gate, where national leaders review mass rallies or gala celebrations on important occasions, is open to tourists. The Monument to the People's Heroes stands in the center of the square. Behind Zhengyang Gate to the south sprawls Mao Zedong Memorial Hall; to the east is the complex which houses the Museum of Chinese Revolution and the Museum of Chinese History. The Great hall of the People stands on the western side. The night scene of Tian'anmen Square is definitely a MUST for any visitor to Beijing.