The Great Wall of China needs no introduction, but anyway: it stretches 6,700 km from the Yellow Sea to the Gobi Desert. It was originally constructed (the first sections built around the 7th-6th century BC) as independent walls between different states; later, it was consolidated to repel Mongol invaders. The last bit of construction happened between the 14th and 17th centuries A. D.
The section closest to Beijing is Badaling, approximately 70km away. There are other sections too, most notably at Simatai and Mutianyu, but they’re farther out, Simatai being 3 hours one way. I’d been warned that Badaling was commercial, crowded, and not authentic (it was reconstructed in the 20th century, so what ...Read More