This steep section of the Hushan (Tiger Mountain) Great Wall—located near the city of Dandong, close to the China-North Korean border—is surrounded by a profusion of green, yellow, orange, and brown foliage. The wall appears to be deserted, and the sky above is a brilliant blue, with a few wispy clouds.

Hu Shan Great Wall, by Yoann Gauthier (CC BY-NC 2.0)