Iceland's Reynisfjara is everything a conventional tropical beach is not — jet-black volcanic sand, roaring Atlantic surf, towering hexagonal basalt columns, and sea stacks stabbing out of the ocean like something from a Norse myth. The contrast between the black shore, the dark cliffs, and the frothy white waves creates one of the most visually striking landscapes anywhere on Earth. Fair warning: the sneaker waves here are legendarily dangerous, so appreciate the beauty from a respectful distance.