Welcome to Jīnshānlǐng
The Jīnshānlǐng (金山岭) section of the Great Wall is a completely restored and, in places, very steep stretch, but it's so far from Běijīng that it sees far-fewer tourists than other fully restored sections. It contains some unusual features such as Barrier Walls (walls within the Wall), and each watchtower comes with an inscription, in English, detailing the historic significance of that part of the Wall. The landscape here can be drier and starker than at, say, Jiànkǒu or even nearby Gǔběikǒu, but it's arguably more powerful, and it leaves you in no doubt that this is remote territory. This is the finish point of an adventurous 6½-hour hike from Gǔběikǒu.