One of 2 Summer Palaces in Beijing. It is built around a HUGE man-made lake. They took the dirt from the lake and used it to build the mountains around it. Then they built the palace on the mountains. It is a truly beautiful sight!
Gyeongbokgung Palace, a beautiful complex of dozens of palaces, buildings, and museums. You can literally spend an entire day exploring just this. If you don’t have an entire day, definitely pre-choose where you are going to go.