To the west of Mutianyu Great Wall, it’s the wild part of Jiankou Great Wall. Previously you can go further up for another 3 watchtowers after Tower 20, which is recently restored and just very few people. Unfortunately the authority erected a barrier wall to stop tourists due to safety concern. You may find some locals climbing over the barrier wall to go further. Frankly speaking, the scenery on top is unparalleled. One ancient Chinese poem goes like this “Try to ascend the mountain’s crest, it dwarfs all peaks under our feet.” The rule is that you can follow suits if some locals do so. Obviously you will be responsible for your own adventure. It’s not dangerous anyway on these 3 watchtowers. If you take this section, it’s suggested you take double-way cable car up and down. Once you reach Tower 22/23, you may want to take a break and enjoy the stunning scenery without any crowds. Double-way cable car will save your time for break on the very top. For further west into the wild section, it depends on your energy and time. The risks are manageable but you have to very active and advanced hikers. Where’s the end of Wall? No, no end… until the Gobi desert in west China.