To strap on your GoPro, do some underwater exploring, and come back with amazingly clear imagery.
Valle Verzasca, Switzerland
The clear waters of the Verzasca River run for 30km through this rocky valley in southern Switzerland. A dam of the same name, featured in the James Bond movie GoldenEye, blocks the river's flow and forms Lago di Vogorno. Just downstream from it, the river empties into Lake Maggiore (Photo Credit: imgur).