The Great Wall of China

The Great Wall of China

Originally built to protect the northern territories of China from invasions, the Great Wall has been rebuilt and maintained for more than 16 centuries. The wall stretches for 5,500 miles (8,851 km), including some natural defensive barriers such as hills and rivers.

Unlike many other fortifications at that time, bricks and stone were used in the construction of the Great Wall, instead of rammed earth. In the Juyongguan pass, the wall reaches 25.6 feet (7.8 meters) in height and 16.4 feet (5 meters) in width. In some other areas, the wall climbs steep slopes and is completed by watchtowers built up to 3,215 feet (980 meters) above the sea level. It is estimated that while building this amazing fortification, more than 1 million workers lost their lives.

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