Sampunzakashita

Yes, it appears to be a real place.  I don't know what you mean by "He took photo of every season."  So, you're not calling it 'photo-manipulation' -- OK, but a piece like this can be done largely with photo-manipulation' along with some tedious, hand pixel work to polish it up.  I've never used Twitter.  I don't know how to find his post.  I've been a computer graphics artist for thirty years -- I should be able to mimic this style with the tools I have.