Everything is renewed, and old diseases need to be cured, Chang' an Yongan!
Chang 'an, as the political, economic and cultural center of ancient China, lasted for more than 1000 years, and 2/kloc-0 dynasties and political powers were established here successively. It was the ancient capital of the 13th Dynasty. Among many dynasties with Chang 'an as their capital, Zhou, Qin, Han, Sui and Tang Dou were prosperous times in the history of China, when Chang 'an had become an international metropolis. From 65438 BC +095 to 25 AD, from 580 AD to 904 AD, Chang 'an was the largest city in the world.