Fortifications of Xi'an

Put your palm flat against the wall. The brick is cool, slightly rough, and grey. Some pieces are darker than others, and a few still carry faint stamped characters. Above you, the rampart rises in one long, unbroken line. On top, you will hear bicycle bells and the soft rumble of tyres on old brick. This is the Xi'an City Wall. It is one of the most complete city walls still standing in China.

What you are touching today is mostly a Ming dynasty structure. The Ming ruled China from the fourteenth to the seventeenth century. Their first emperor, Zhu Yuanzhang, began rebuilding Xi'an's defences early in his reign, in the 1370s. But he did not start from empty ground. His builders used the line of an older wall. That wall once surrounded the imperial city of the Tang dynasty, when this place was called Chang'an.

Chang'an deserves a moment. More than a thousand years ago, it was the capital of the Tang empire. It was also the eastern end of the Silk Road. Merchants, monks and envoys arrived here from Central Asia, Persia and beyond. The Tang city was enormous, far larger than the area inside these walls. So the Ming wall is really a smaller core. It sits inside the outline of a much greater capital.

There is a well-known story about why the Ming emperor built so many walls. According to this tale, a scholar advised him to build high walls, store plenty of grain, and be slow to claim the title of king. Historians repeat the story often. Whether or not the words are exact, the idea matches the age. A strong wall meant time. And time meant survival during a siege.

Now look at the shape of the wall itself. It forms a long rectangle, roughly thirteen to fourteen kilometres around. It stands about twelve metres tall. The top is wide enough for several people to walk side by side. It is even wide enough for a cart, or today, for a line of cyclists. The base is wider still. The wall leans slightly inward as it rises, which makes it more stable.

Here is a detail many visitors miss. Every so often, a square platform pushes outward from the wall. These are ramparts, or bastions. Builders spaced them so that archers on neighbouring platforms could cover the ground between them. An enemy at the foot of the wall had nowhere safe to stand. Arrows could reach him from both sides. Count them as you walk. The rhythm stays very regular.

Outside the wall runs a moat. Today it is a green, quiet strip of water and trees. Locals walk dogs there, practise tai chi, and sit on benches in the shade. In the past, the moat made the wall far harder to approach. Attackers had to cross water before they could even reach the brick. Now it gives the wall a soft frame of willows and reflected light.

The four main gates face the four directions. Yongning Gate is in the south. Changle Gate is in the east, Anding Gate in the west, and Anyuan Gate in the north. Each main gate was a small fortress of its own. An outer enclosure, called an enceinte, guarded the entrance. If attackers broke through the first door, they found themselves trapped in a walled courtyard. Defenders could strike them from above.

Above the gates stand tall wooden towers with curved tiled roofs. The outer one is the archery tower. Look at its face, and you will see rows of small square windows. Archers once fired through these openings. The inner one is the gate tower, where commanders could watch the city and the road. Together they give each gate its layered, stepped look against the sky.

You may also hear claims about the mortar. A popular account says the builders mixed lime with sticky rice to bind the bricks. Sticky rice mortar was a real technique in parts of China, and researchers have studied it. But how much of it holds this particular wall together is less certain. So treat it as a good story, partly true for Chinese building in general. Then look closely at the joints and decide for yourself.

The wall has not survived untouched. Over the centuries, sections crumbled and were rebuilt. In the twentieth century, parts were damaged or neglected. A large restoration began in the late twentieth century, and the broken sections were reconnected. That is why you see new brick beside old brick. The contrast is honest. It shows a structure that people have repaired again and again, rather than a frozen relic.

Today the wall is a place for daily life as much as history. People rent bicycles and ride the full circuit on top. Runners use it for races. During the Spring Festival, the ramparts fill with lanterns, and red light spreads along the battlements at night. On a summer evening, the stone holds the day's heat, and the city glows below. You can see both the modern towers and the curved roofs of the old town from here.

From the top, look inward. In the centre of the old city stands the Bell Tower, and the main streets run out toward the gates. The grid is still easy to read. Then look outward, past the moat, to the traffic and high-rise blocks. The wall sits exactly on the line between these two worlds. Take a slow breath here. Listen to the bells of the bicycles, the wind through the flags, and the city moving on all four sides of you.