Core Readings:
Ruins of Desert Cathay, Vol I, Chapter VI, On the Darkot Pass, pp. 52 to 62. https://archive.org/details/ruinsofdesertcat01stei/page/52
Photo: Sarikol Fort 1906 This link shows the ancient Chinese fort at Tashkurgan described by both Stein and Xuanzang.
The scene below was photographed by Stein. in the same region.