What's the use of Civilization 6 tourism performance?

In Civilization 6, the function of tourism performance is to win cultural victory. The key is to increase the number of tourists, which can win cultural victory, but it is very difficult to win cultural victory, because most of the tourism performances need to be accumulated slowly, and most of them will be added to Chengdu in the later stage. At the same time, the means to obtain tourism achievements are very slow, such as sacred relics and national parks need faith investment, and great works need cultural and architectural investment.