请帮我用一篇简短的英文介绍一下西安的旅游景点,不需要太复杂

The city of Xi'an was the first Chinese city to open up its doors to the Ancient world, not in 1980 under the "Open Door" policy but in fact during the Tang dynasty when Xian blossomed as the first stop on the Silk Road.

Many dynasties kept the city beautiful and magnificent. More than two hundred and seventy palaces and temples, for example, were built in the Qin dynasty, in the Han dynasty the "Three Han Palaces", namely Changle, Weiyang, Jianzhang Palaces, and numerous other palaces and watch towers were built. In the City of Chang'an of the Sui and Tang dynasties, luxurious palaces sprang up like tree, of which Taiji, Daming and Xingqing Palaces and the forbidden garden of the Tang dynasty to the north of the town were very large. Now, from these architectural sites people still can imagine the general picture of what Chang'an City was like, then. All the emperors of the Qin, Han, Tang and other dynasties had their magnificent mausoleu