Introduction to Hufengkou: "Hufengkou" is a steep intersection with twists and turns. When the wind blows, the sound is like the roar of a tiger, hence the name. Beside this windy road, there is a vigorous and simple pine tree called "Brahma Palace Hanging Root". Its roots are exposed, but it can stand upright in the wind and never fall down for thousands of years. It is a wonder of Mount Hengshan.