The Zaoyuan Revolution Former Site was previously the manor of a landlord. After the CPC Central Committee moved to Yan’an, it became the site of the former CPC Central Committee Investigation Department. The site was renamed "Yan Yuan," and there are Chinese characters "Yan Yuan" written by Kang Shu on both sides of the stone pillars at the gate of the site. The site now comprises the small hall of the Secretariat of the CPC Central Committee and the former residence of Mao Zedong, Zhou Enlai and Liu Shaoqi. It is also a garden-style revolution commemoration site and a major base for providing traditional revolutionary education in China, attracting countless travelers throughout the year.