Answering
- Where is there? Flat terrain abruptly followed by mountains is possible but unusual.
I was unable to identify the exact location - nowhere that I could see on the Hellbrunner Strasse seemed to provide a perfect match for the scene, but somewhere around the areas shown below seems likely. The red line shows the general line of the road and the oval is the massif formed from several mountains, one of which is Untersberg - which may lie slightly more in Germany than Austria.
Hellbrunner Strasse runs (as far as I can tell), with occasional changes to other names and then back again. from about the southern point shown, north into Strasburg proper. Other more northerly locations seem less likely due to an increase in buildings and general reduction on open landscape.
Gargoyle maps provides

Musings:
Note: I liked the picture when I first saw it and I like it now, and it sounds like there was not a vast amount of manipulation involved. My comments below do not relate negatively to what has been done to create this image:
The questions are all legitimate, but, adding to my recent reflections on submitted photos, makes me wonder why it matters. This forum, like many others, seems to be open to unspecified and unlimited amounts of manipulation. As long as a camera was involved in generating the base source material in some manner, or perhaps most or some of it, almost anything goes. Apparently.
Some major competitions which are open to the general public very specifically place no limitations at all on what can be done "artistically" to a 'photo' entry, and judges often choose entries which, thankfully enough, no camera could ever have created in this version of reality. Art in any form is fine enough in its rightful place (which in some cases is far far far away :-) ) but it seems a shame (to me) that the art form has in many cases come to require more graphic arts than light-through-a-piece-of-glass skills.
Where do you draw the line ?
Apart from, 'Nowhere at all. If it feels, good do it.'?
3 examples done for my own purposes.
No great editing skills claimed or displayed.
Editing aim is to remove or alter content which was not relevant to or distracted from main theme.
Not aimed at competitions or display etc (except for friends).
No, I didn't ADD the rail. Swap A & B :-). Old man in Hong Kong. Posed only to the extent that I saw the photo coming and wited while he slowly shuffled into position. I have a few before and after, but this was the one I anted. The rail was portable but not movable by me in circumstances. It had to go. No?
Qingdao chess. At some other time the car and clothes would not have been there. The yellow pipe and valve would still have been :-(. Still a piece of clothes line left behind :-).
Yogyakarta labourer. Iron abs. Bare feet & steel pedal shafts! Axe, sickle, helmet, ... Wow. The motorcycle and red machinery in background were a sad distraction. Olin?
