The Great Wall of China is a series of walls that stretch from Liaoning through Hebei, Tianjin, Beijing, Inner Mongolia, Shanxi, Shaanxi, and Ningxia into Gansu within the country of China.
The Great Wall of China can be visited at many places along its length of several thousand kilometers. Its condition ranges from excellent to ruined and access varies from straightforward to quite difficult. Note that different sections also each have their own admission fees, e.g. if you want to hike from Jinshaling to Simatai then you probably have to pay twice. Although its construction is popularly associated with the tyrannical reign of the first emperor, Qin Shi Huang Di in the 2nd Century B.C., the wall that tourists see today dates much later to the Ming Dynasty.