inscription "serve the people" in Mao Zedong's handwriting. In 1959, an underground passage was built between Xinhua Gate and the Great Hall of the People shortly before the construction of the latter was completed. This passage was intended to be used only by members of the Politburo Standing Committee at the time. Gallery See also Beidaihe District Diaoyutai State Guesthouse History of Beijing Imperial City, Beijing Beihai Park Summer Palace Old Summer Palace Jade Spring Hill Presidential Palace, Nanjing References Major National Historical and Cultural Sites in Beijing Buildings and structures in Beijing Headquarters of political parties Official residences in China Presidential residences Xicheng District