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Santorini is one of the great natural wonders of the world, and its main attraction is the landscape and seascape of the island itself. The configuration of the present, roughly semicircular island is the result of an enormous volcanic explosion which occurred probably around 1630 bce, literally blowing the top off the island and changing what had been a typical half-submerged mountain of an Aegean island into a flooded crescent caldera, in the middle of which a few small smoking islands still bear witness to volcanic activity. Some have speculated that this event was the inspiration for the myth of Atlantis.