While you might expect Santorini, Greece to be filled with beautiful beaches, this beauty has a violent past, as the island has been the site of massive volcanic activity, including the Minoan eruption. The volcanic activity that took place across the region is especially evident at Perissa beach, which is filled with black volcanic sand. Perissa beach extends about four miles (seven kilometers) along the southeastern side of Santorini. The stretches of black sand strike a glorious contrast to the region’s light blue waters. You may simply want to spend your…