Five-hour glacier treks bring you up close and personal to the glacier's myriad peaks, fissures and, if you're lucky, the ice cavern the lake hollows underneath, all effusing an ethereal blue glow.

Thee world's first glow in the dark ice cream was handed out to a cinema audience who were surprised to find their snacks glowed a fluorescent yellow when the lights went out.

In order to create the gleaming gelato the ice cream is mixed with riboflavin which gives out a glow when under certain UV lights.