Imagine dining inside a soaring cave that's open to the air. Outside, the Adriatic is sparkling blue, and waves crash on the rocks below as you savor delectable seafood and a fine white wine. Italian nobility have been dining here for centuries. Now you can, too.
For a really cool adventure, how about an ice cave? This incredible spot is part of the Fox Glacier, in New Zealand. You might need to wade through icy waters to reach a spot like this, but the magical light of the glacier-blue ice is a spectacular reward.