In the valley of the Bull (La quebrada del Toro) in severoargentinskoy Salta Province is probably the most scenic bus station in the world. On both sides of Ten-kilometer valley surrounded by mountains. Slopes and clouds at sunset changing shades and lonely cactus crown shining in the sun ...
I do not know how often buses (for the whole day on this road, I did not see any), but for sure: wait for a stop - a pleasure!