Santorini Sail and Swim
A magnet for volcanologists, Santorini marks the site of one of the largest volcanic eruptions in history, resulting in a collapsed crater, or caldera, that created some of the world's most beautiful islands. On the southern coast of Santorini, board a luxurious catamaran to sail along the contrasting red and white beaches, around the western tip of the island, and into the caldera for glorious views of the soaring cliffs and lunar-like landscape.