Aristotle considered Plato's Atlantis to be an invention; so we read time and again - but is this really true? Until the late 19th century, academia still held the opposite opinion. How did this shift in opinion take place? And was it justified? Over 100 works from the Atlantis and Aristotle literature, from antiquity to the Renaissance, from the 18th to the 21st century, were examined in order to track down the truth. A scientific adventure regarding Aristotle's opinion about Atlantis unfolds step by step, starting 200 years ago and reaching into the present. What did the great philosopher and disciple of Plato really think? All the relevant passages from Aristotle's works as well as all the steps taken during the literary research are documented in the appendix.