The lost city (or island) of Atlantis
Plato described Atlantis as a island nation existing in the middle of the Atlantic Ocean. It was said to be populated by a great and powerful race and was a center for trade and commerce during that era. The sheer scale of everything Plato said about Atlantis, from the grandeur of its buildings to the enormous timescale involved, has provided a controversial debate that has lasted for over 10,000 years.