Santorini is one of the Cyclades islands in the Aegean Sea. It was destroyed by a volcanic eruption in the 16th century BC. J.-C., which definitely shaped its rugged landscapes. The cube-shaped white houses of its 2 main towns, Fira and Oia, cling to cliffs overlooking an underwater caldera (crater). They overlook the sea, small islands to the west and beaches made up of black, red and white lava pebbles.