For me the answer to the question "should this be on topic" is emphatically No.
For me one of the major points of SE sites is; to be a repository of useful information (not just answering the askers question but providing a placeholder so someone else doesn't have to ask the same question again).
Number of issues:
- Is this question useful to anyone else?
- How would anyone find this question again.
- Most of these photos (that one included as iStockphoto is pay site) is probably covered by copy write issues.
- Will the site descend into a pub quiz of "spot the mountain", "name this person", etc. etc. type question.