What is the big disc above Wang Di in Nanning?

Hello! The top of the big disc above the Wang Di in Nanning is used for parking helicopters, and the inside (that is, the middle part) is used for sightseeing Nanning scenery. The walkway inside is made of wood, and there is a small supermarket selling snacks and drinks, as well as souvenirs. The most distinctive feature is that there is a part of the floor with a map of Nanning on it. Specifically, you can go sightseeing. It is suggested to go in the evening, so that you can see the scenery of Nanning during the day and soon.