《资治通鉴·汉纪·汉纪十三》
据公孙卿说，神仙喜欢住在楼中，于是汉武帝命人在长安兴建蜚廉观、桂观，在甘泉兴建益寿观、延寿观，派公孙卿携带皇帝符节，布置好全部设备，恭候神仙降临。
公孙卿言仙人好楼居，于是上令长安作蜚廉、桂观，甘泉作益寿、延寿观，使卿持节设具而候神人。
According to Gongsunkun, immortals liked to live in towers, so Emperor Wu of the Han Dynasty had the Feilian Pavilion and Gui Pavilion built in Chang'an and the Yishou Pavilion and Yanshou Pavilion built in Ganquan, and sent Gongsunkun with the emperor's talisman to arrange all the equipment and respectfully await the arrival of immortals.