Naoshima is a small island of Kagawa prefecture in Japan which has been promoted as an "art island". It surely is an island full of art and is a really interesting place to visit. You will be greeted by a huge red "pumpkin" - a sculpture by Yayoi Kusama, and the Minamidera House project "Backside of the Moon" by James Turrell and the Chichu Art Museum by Tadao Ando are the must-sees. (They don't let us take photos of the museum even from the outside so here are some images from the museum catalogue)
I'm so wanting to go back there.