Introduction to the East and West Palaces: Echoing the main palace are the East Palace and the West Palace on both sides, which are where the imperial concubines who accompanied them to the south stayed. There are six cypress, persimmon, tung, chrysanthemum, locust and poplar trees planted in the courtyard, which means "a hundred cities share the same spring" and "a hundred generations of poplars", symbolizing the prosperity of the Qing Dynasty and the Chinese nation from generation to generation.