About this place
A 1960s industrial railway tunnel repurposed as part of the Laotie Shancheng walking trail, roughly 200 meters long, dark and echo-heavy.
Drifter says
"Free and completely open. Takes about 5 to 10 minutes to walk through. Stand in the middle and shoot toward either opening for high-contrast silhouette images. The trail connects naturally from the SISU campus old railway tracks, leading you through the tunnel toward the Geleshan..."