This is so strange. I have almost been there.... on a work trip where i visited the hydro power plant just 50-100 meters down the road. Had no idea that was there...
Just a site visit as part of a larger trip in the country (some knowledge exchange stuff in a hydro power company i used to work for), so we were visiting several parts of the power plants down the Aconcagua valley among other areas. This was the highest point of that particular part of the trip.
I took a bus from Mendoza to Santiago that went down this road. Was pretty crazy at the time but still way less sketchy than the buses going through Bolivia.
Not this road, but the most beautiful place I have driven was in Andalusia, in the south of Spain, earlier this year, absolutely gorgeous mountain roads, light and easy traffic (early spring) and good restaurants.