Yanmen Pass is definitely worth a visit. I visited the Badaling Great Wall many years ago, and the experience was different. The day I went, the fog was quite thick, so visibility was limited. Also, I arrived rather late, so I didn't explore too far, but the early winter scenery was still beautiful. The difficulty of the climb further highlights the hardships endured by the ancient soldiers, and it makes one marvel at the wisdom of the ancients in building this magnificent pass.