Perhaps the LAST update to this, by far the most visited post on RickMcCharles.com:
location of Guoliang – Google Maps
If you use Google Earth software, a link to the location can be found on this page.

Aside from the location links, George Novak also found a 2003 travelogue posted on a Chinese website:
… there are two ways to get to the village. One is to climb the Tianti, a stairway cut into the rocky mountain, while another is to travel through the Guoliang Tunnel.
We chose the tunnel. Sitting by the elderly driver I was lucky to hear the story about the tunnel.
Before 1972, the path chiseled into the rock used to be the only access linking the village with the outside world. Then the villagers decided to dig a tunnel through the rocky cliff.
Led by Shen Mingxin, head of the village, they sold goats and herbs to buy hammers and steel tools. Thirteen strong villagers began the project.
It took them five years to finish the 1,200-metre-long tunnel which is about 5 meters high and 4 meters wide. Some of the villagers even gave their lives to it. On May 1, 1977, the tunnel was opened to traffic.
When I was mulling over what the tunnel looked like, the van started a very steep ascent.
I looked up and could not move my eyes away – it was so beautiful!
Natural Charms Soothe City Stress
=====
Nov 4, 2006
LoriMc found conclusive evidence:

The Light at the End of the Guoliang Tunnel – China Tourism magazine
More photos of the region on Jongo.com
=====
Not Bolivia, Peru, Taiwan nor Sichuan province in China.
How can it be so difficult to locate this amazing road?
LoriMc commented on this blog post, pointing to a flickr set including this image:

It appears this road is in Taihang Mountains of China. I ASSuME this because the photographer called his set Taihang – gorge hiking.
Not conclusive, but the best evidence so far. Thanks LoriMc!
=====
updated post from Nov. 3rd
Mystery solved (I think).
Overnight many including Warren Long discovered that these "Bolivian" road photos were actually taken in Sichuan province, China. These are the cliff roads of the Tibetan plateau, off-limits to tourists when I was hiking there in 1997.
At that time only military vehicles were allowed.

more photos on Flickr
=====
original post from Nov. 2nd
Thousands of websites are tagging this the Stremnaya Road in Bolivia — the “road of death”.
I doubt that is correct. Locals have denied it on the Bolivia Web blog.
Sounds to me like people are confusing these photos with “the world’s most dangerous road” in Bolivia. I’ve been there. This photo was not taken there.
It’s not Cañon del Pato in Peru as some suggested. I’ve been there too and I’m pretty sure these photos were not taken on that road.
I expect it is in the Andes … somewhere.

Leave a comment if you solve the mystery.
George checked out the Central Cross-Island Highway (Chungheng) linking the east and west coasts of Taiwan. The highway cuts through some of its most rugged land, including the famous marble Toroko Gorge. <