The image pair were constructed from a photo presented by someone else somewhere else on Reddit, viz https://www.reddit.com/r/scenery/comments/1v0yros/this_scenery/
Unfortunately, the original used here was removed by "Reddit's filters" for an unstated reason. So, if you like this 3D version download a copy lest it too arbitrarily is removed.
Two 3D versions are posted. They differ only in that the depth parameter was increased for the second image pair.
The title refers to the original image being "upgraded". In this instance, the term is justified. The monoscopic version is an excellent photo in its own right, but the conversion to 3D makes the image truly remarkable.
The quality of the combined (in one's brain) image pairs is outstanding respecting features additional to aesthetics.
When parallel viewing any image pair it is helpful to begin with the images small on the screen of a laptop device, and slowly to enlarge them until maximum comfortable dimensions. Generally, the limit, i.e. components beginning to diverge, is reached well before the maximum. This instance is remarkable because the limit is not quite reached even when the image pair exceed the size of the screen. That is, one may continue viewing a section in 3D so long as both components of the overall image are visible. Furthermore, the second image pair gives a little greater latitude.
Why is this 3D image so technically excellent? One may surmise fine detail in the 2D version contributed.