Japan

if you're into art and/or architecture you really should visit the benesse art site islands http://www.benesse-artsite.jp/en/
they're in the inland sea so not that far from osaka and well worth the trouble of getting out there.

Just got back from Japan and I have to say Naoshima Island was one of the top highlights, thanks so much for the tip. Really incredible place and Benesse House was fantastic. If anyone is planning on going to Japan you really should put this on your itinerary. Thanks again :)