The ancient tea-horse road, starting from Pu'er in Yunnan, passes through Dali, Lijiang, and Shangri-La. After arriving in Lhasa, it continues to travel to Nepal and India. The ancient city of Dukezong in Shangri-La is the first stop after the caravan entered Tibet. Duke Zong Ancient City, built in the Tang Dynasty, Tubo people set up the Zhaibao on the top of the Big Turtle, named "Duke Zong". In Tibetan, Dukezong has two meanings. One is the castle built on the stone, and the other is Moonlight City. Obviously, "Moonlight City" is more elegant and elegant. After more than a thousand years, the ancient city of Dukezong has expanded its scale around Daguishan and has more and more people living in it. Now it has become a famous tourist attraction in Shangri-La. The prayer wheel at the top of Kameyama in the ancient city of Dukezong is 21 meters high and weighs 60 tons. It is the largest prayer wheel in the world and has become the symbol of the ancient city of Dukezong. However, in January 2014, there was a big fire in the ancient city of Dukezong. Because the ancient city was a traditional Tibetan wooden house, and the road was narrow, it burned more than a hundred rooms and almost burned the entire ancient city. It is a pity. After more than a year of construction, the ancient city has returned to its original appearance and remains a quaint Tibetan feature. It is not as crowded and commercialized as the ancient city of Lijiang. It is a clean ancient city.