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Great Wall of China
Imagine a huge wall stretching for thousands of miles across the land. The wall winds through hills, climbs mountains, and crosses deserts. If you visit China you can see a wall like this. The Great Wall of China, as it is known, is the longest structure ever built.

The Great Wall of China zigzags across parts of northern China. It was built section by section over centuries. In fact, there are many gaps between the sections, so the Great Wall isn't a single, solid wall. But if all the sections are measured, the wall is about 4,000 miles (6,400 kilometers) long!

WHY WAS THE GREAT WALL BUILT?

Since ancient times, Chinese people have built walls to protect their borders. Some walls were built between parts of China that were fighting each other. Other walls protected China from outside invaders.

More than 2,000 years ago, the first emperor of China built a long wall to defend the northern border. The emperor, Qi