Olympia, site of the famous Temple of Zeus and original venue of the Olympic Games in ancient Greece, was presumably destroyed by repeated tsunamis that traveled considerable distances inland, and not by earthquake and river floods as has been assumed to date. Evidence in support of this new theory on the virtual disappearance of the ancient cult site on the Peloponnesian peninsula comes from a researcher in Germany.

Source: Olympia hypothesis: Tsunamis buried the cult site on the Peloponnese