[richlevy]

Originally Posted by Undertoad

Rich, people have sent me that road before, but I can't document it any further than that thread, which is really weak on details IIRC. Either it's very remote and thus rarely mentioned anywhere, or it's a hoax.

Mystery solved. I am the King of Google.

It's actually in China, not Bolivia.

From here, also here.

Guoliang Tunnel is different from other road tunnels; it is quiet, secluded and mysterious, bright one minute and dim the next, full of twists and turns. The wall of the tunnel is uneven and there are more than 30 "windows" of
different sizes and shapes. Some windows are round and some are square, and they range from dozens of metres long to standard-window-size. It is frightening to look down from the windows, where strange rocks hanging form the sheer cliff above and a seemingly bottomless pit lying below. A village, opposite the tunnel, appears to hang on the precipice.