

The construction of the Great Wall began between the 7th and 8th centuries B.C. when the warring states built defensive walls to ward off enemies from the north and were constructed to a full length of 6,700 kilometres. To ensure the safety of the dynasties, the feudal rulers strove to improve the construction of the Great Wall after it took shape in the Qin dynasty. In particular, the Ming dynasty saw the creation of a sophisticated defence system along the wall embracing garrison towns, garrison posts, passes, blockhouses, additional wall structures, watchtowers and beacon towers, each given a different status and designed mission.
