I was surprised not to be able to find a full-resolution image of the lovely panoramic background from the sacred forest scene in Princess Mononoke. I assembled this one from screengrabs. It had to be cropped a bit and there’s an imperfection on one of the trees that’s in the film, but it’s better than any other version I could find. Click this one for full size:
The Gygerkarte, or Gyger Map (and detail), made in 1667 by Hans Conrad Gyger and one of the first ever to represent a landscape in this intricate and accurate fashion.