The Great Wall Of China

The Great Wall Of China is a ancient wall.It is a Chinese empire . They built this for protection from enemies.The wall is  made out of rocks and dirt,now its rebuilt with brick.It is more than 2000 years old before Christ was born. The wall is the longest structure ever built by humans in history.It is an big tourist attraction.It is 13,000 miles long.It was also built so mongols can not get in.