What lessons can rainforests give modern cities? CGTN's Yang Xinmeng visits Xishuangbanna, China's only tropical rainforest city, with mayors from all over the world. The city built wildlife corridors and set up ecological compensation programs. Wild elephants can now walk freely through villages. Local night markets thrive on rainforest products and diverse ethnic cultures. Here, environmental protection and economic growth benefit each other. Mayors from many countries gather here to find out what Xishuangbanna can teach cities around the globe.