The Blue Grotto (or Grotta Azzurra) is the most famous site on Capri, and it's easy to see why. The grotto is a natural sea cave with a small entrance, and it is illuminated in a blue and silver ...

Located in the scenic Chamonix Valley near France's triple border with Switzerland and Italy ... dig a walkable ice cave, or ice "grotto," directly into the glacier's deep blue ice.