Plato's account, written around 360 BC, describes a powerful empire that angered the gods and sank beneath the sea more than 11,000 years ago. This entry in the World of Mysteries series follows that story from ancient text to modern search, asking whether Atlantis is a real place or an invention Plato built to make a philosophical point. The film narrows the search to three candidate islands. Santorini, in the Aegean, carries the scars of a massive volcanic eruption that buried a Bronze Age settlement in ash. Crete's Minoan civilization is examined for ties to the Atlantis legend and its role in shaping the ancient Mediterranean world. Tenerife, out in the Atlantic, is presented by some researchers as a surviving fragment of the lost continent itself. Geologists, historians, and Atlantis researchers weigh the evidence at each site, and the film moves between them without settling on one answer, leaving the location of Atlantis as unresolved as it was when Plato first wrote it down.