The extraordinary jet-black fine lava beach Reynisfjara in southern Iceland, the most beautiful "non-tropical" beach in the world overlooking the rock formations in the sea. Incidentally, it is also one of the most dangerous places in Iceland. The sea may look calm, but the unexpectedly powerful waves and strong currents have already dragged several tourists into the water with the worst consequences. Fortunately, there are good warnings about this before you walk onto the beach.