Which anime has the most beautiful background?
Probably something Shinkai directed or something by Ghibli.
Basically this, even though you can find great BGs in TV anim, movies have a better average of great backgrounds.
Mostly 3DCGI animation and all that, but I'll tell you Ronja's BG were the standout of the series, and the staff in charge was known for their feature films work. This is not such a clear cut definition.
Aside from that, Studio Pablo rules, and people like Kaneko did beautiful art direction on TV works like KlK too.
Are you sure?
Zankyou no Terror
Raildex has some great ones for city landscape
We need a chart like this, but for backgrounds.
Here is one with nature scenery and urban scenery what other categories should the chart have?
I loved Tekkon Kinkreet backgrounds, probably still my favorite ever.
Tiger & Bunny looked surprisingly nice for its shoestring budget.
Beautiful? Hard to say.
Ghost in the Shell for instance is definitely among the top for intricacy and detail.
If we talk about beauty as in soothing and relaxing, several Ghibli films, because that's kind of what the studio does with most of their productions: creating very comfortable looking and feeling scenes, however not necessarily with technically mind-blowing art.
Mushishi is ridiculously good at capturing nature, but it has a lot to do with direction rather than only the background art.
The question is too wide.
The background art was the only redeeming aspect of Owari no Seraph.
I'd post better images but I don't have it downloaded, their painting process also popped up on google http://imgur.com/gallery/0pAKV
Beautiful as in very pretty to look at and visually appealing i guess, but beauty does have different meanings.
Soothing and relaxing works. The Gochiusa backgrounds aren't perfect but it's so damn comfy makes me want to live there
Yes from Gochiusa. But expecting alot for MIA next season
A little snow fairy sugar has tons of comfy backgrounds
coppelion has freaking amazin backgrounds
AoT has Spring's best backgrounds
Kimi no Na Wa may be his best work, but Garden of Words is by far his prettiest.