Its geological particularities, its past, and its imposing scenery single out Santorini.  Bright white domed houses cling to the cliff sides of the caldera formed by the volcano's explosion in 1500 B.C., and have an incredible view of the Kameres (burnt ones)--the coal coloured islets in the middle of the bay. Some of the most spectacular beaches can be found on Santorini; some with dark pebbles and others with black sand. A whole civilization is coming to light at the archaelogical digs at Akrotiri--a prehistoric city--and Messa Vouno, where the ruins of ancient Thera lie. And beneath the sea are spectacular volcanic formations, caves, walls, and ruins as well as prospects for treasure dating back thousands of years.