Located in Huairou, China, the Great Wall of China was built over 2000 years ago in the 3rd century BC & was rebuilt in the 15th century. The purpose of the wall was to stop invaders from accessing the northern border. The wall is made up of 23 watch towers and over 13,000 miles across China. Originally, the length was 3,100 miles and took over 1 million laborers. The Great Wall is made of stone, brick, wood, amongst other materials starting in Shanhaiguan and ends into the sea.
The world’s longest defensive fortification is not just one wall but a system of walls built over 2000 years. The Great Wall of China is a powerful symbol of the unification of China under the rule of the Qin Dynasty. As of date, there are around 10 million visitors every year.