The first landmark visitors will encounter in Xi'an was its ancient City Wall, which stretches just outside the railway station. Xi'an was originally a walled city, and even today the wall is considered a landmark dividing the city into the inner part and the outer part.
The city wall is massive - it is tall, long and thick. The South Gate and North Gate are the two main entrances to the inner city. The city itself is neatly arranged along the city wall.
The City Wall was first erected in 14 century, under the regime of Emperor Zhuyuanzhang in the Ming dynasty. At the time when Zhu Yuanzhang captured Huizhou, long before the establishment of the Ming Dynasty, he was admonished by a hermit named Zhu Sheng, who told him to "built high walls, store abundant provisions and take your time in proclaiming yourself emperor", advice which Zhu Yuanzhang heeded. Once the whole country was unified, he sent orders to the local governments to build city walls on a large scale. Zhu assumed that "out of all the mountains and rivers in the world, the central Qin is the most strongly fortified and strategically impregnable."