Introduction to the air viewing platform: The air viewing platform is also called Zhanzi Tower. It is said that Yin Xi, the commander of Hangu Pass, climbed up one day to observe the celestial phenomena. He saw purple air floating in the east, and the sky was filled with steaming clouds and beautiful clouds. Spectacular. This building was destroyed by war during the Republic of China. What can be seen now are antique buildings built in recent years.
"Historical Records: Biography of Laozi" records: Laozi cultivates morality, and his main task is to hide himself in anonymity. After living in the Zhou Dynasty for a long time, he saw the decline of the Zhou Dynasty, so he left and went to the pass. Yin Xi, the commander of the pass, said: "My son is in hiding, so he forced me to write a book for me." So Lao Tzu wrote the first and second chapters of the book, expounding the meaning of morality in five thousand words, without knowing where it ended. "Biography of Immortals": Guan Ling Yinxi is also Doctor Zhou. He is good at studying the stars internally, taking in the essence, hiding his virtues and practicing benevolence, and no one knows about it at that time. When Lao Tzu traveled to the west, he liked to see his spirit first and know that the real person had done something wrong. He waited for the appearance of things and traced them, so he got the result of Lao Tzu. Lao Tzu also knew its wonders and wrote books about it. "When I traveled to the west, Yin, the commander of the Pass, saw purple air floating on the pass, and I passed by on a green ox.