Along the steep cliffs of the Nujiang River canyon in southwest China's Xizang Autonomous Region, a former tunnel has been transformed into a small museum preserving the history of the Sichuan-Xizang Highway's construction in the 1950s.

Built into the mountainside, the site documents one of the most challenging infrastructure projects on the Qinghai-Xizang Plateau. Through old photographs, preserved construction tools and recreated work scenes, visitors can glimpse the harsh conditions faced by workers and soldiers who carved roads through dangerous terrain and built the first bridge across the Nujiang River.

Today, the former tunnel stands not only as a historical site but also as a reminder of the early efforts that helped connect remote plateau regions with the outside world. (Photo credit: CGTN's Qu Bo)