Hanging+in+their

 The Great Wall of China! Type of barrier: Political/Economic I'm pretty sure that if you are reading this you have heard of the Great Wall of China before. The Great Wall of China is the longest man made structure in the world! A lot of people think the wall was built for war, but it was actually built for defense! The wall has several different parts each coming together to form the structure. Since this wall is so big casualties were constantly rising. 2 to 3 million Chinese died building the Great Wall of China! All of that is very astounding, but personally i think it's so amazing becuase it has lasted so long but it's just made up of wood, earth and stone!