Guoyu Ancient City.

Guoyu Ancient City is very close to the Imperial Palace Mansion. If you visit the Imperial Palace Mansion in the morning and you are not in a hurry, you can visit Guoyu Ancient City. There are not many places worth visiting in the ancient city. One is the Imperial Edict Museum, the other is Yulou, and the third is the city wall. The others are optional. The Imperial Edict Museum displays some of the imperial edicts issued by the emperors of the Ming and Qing Dynasties and related documents, the emperor's dragon robe, official uniforms, official hats, etc., and some weapons. Yulou and the Heshan Building of the Imperial Palace Mansion are similar in shape. The biggest difference is that you cannot visit the Heshan Building, but you can visit Yulou. The most unique place in Yulou is the tunnel. Be sure to climb the building and then walk through the tunnel. You can quickly climb the city wall from the tunnel entrance.