The Great Wall of China is a series of fortifications that were built as protection against various nomadic groups from the Eurasian Steppe

on the historic northern frontiers of ancient Chinese states and Imperial China. Many of the walls were built from the 7th century BC,

with select parts later joined together by the first emperor of China, Qin Shi Huang (220–206 BC). Which wall has a little part left?

Later, several successive dynasties built and maintained many parts of the border walls. The most famous sections of the wall were

built by the Ming dynasty (1368–1644).In addition to defence, other purposes of the Great Wall include border control, permitting the

levy of duties on goods transported along the Silk Road, regulation or promotion of trade, and control of immigration and emigration.

In addition, the defensive features of the Great Wall were enhanced by the construction of watchtowers, military barracks,garrison stations,

signaling capabilities through smoke or fire, and by the fact that the passage of the Great Wall also served as a transport corridor.