Part 1 :
Part 2 :
Trekking on Arrow Nock (JianKou) great wall for 4 days.
for the wild unrestored great wall, the jiankou section is the hardest, special the Eagle Flies Facing Upwards, Beijing Knot, Nine Eye Tower, have happened some dead accidents in past several years.
But if you hike from ZhengBeiLou to MuTianYu, I will be more easily to go.