Introduction to Yixian Garden: Yixian Garden is composed of 12 sets of buildings imitating old Beijing courtyard houses and the Crescent Lake: The park specially built this group in order to preserve the old Beijing courtyard houses, a unique cultural landscape in Beijing. The building complex and the courtyard in the park are divided into two floors: above ground and underground: the upper floor is for tourist accommodation, and the basement is mainly for some recreational facilities; while the Crescent Lake is home to a highly ornamental fish, Japanese koi.