Great wall at mutianyu used to serve as the northern barrier defending the capital and imperial tombs in the ming dynasty 1368 1644 this section is surrounded by woodland and streams it is a section restored in early 1980s however you will do a secret part of the wall by starting hiking at a remote village its easy to access by 45 miles away from beijing the trip will finish 12 densely placed towers with a total length of 2 km in 2 hours