A massive volcanic eruption around 1650 B.C. forced the center of what was then a single island to implode and succumb to the sea. Some say that this was the original home of the lost city of Atlantis, which long ago disappeared into the ocean's depths. Whatever remains of this mythological metropolis is now guarded by beautiful beaches and stately whitewashed homes. Today, Santorini consists of two inhabited islands and several islets.