Naoshima, Japan

The island of Naoshima on the Seto Inland Sea is hardly a secret, but it almost feels like one. It's not easy to get to: the Shinkansen gets you to Okayama, then it's two trains and a boat before you finally reach the island. Once there, however, you get it almost immediately: This is basically the Marfa, Texas of Japan, but instead of Donald Judd it's a testimony to the genius of architect Tadao Ando. Photos are prohibited inside the buildings, but suffice to say that they're some of the most incredible works in concrete you'll ever see, gravity-defying and utterly mesmerizing. And inside, they show off the works of James Turrell, Lee Ufan and Claude Monet to spectacular effect.