Temple of Poseidon
A view of the ancient Temple of Poseidon at Cape Sounion, south of Athens, in 2004. "The sea was driven back, and its waters flowed away to such an extent that the deep sea bed was laid bare and many kinds of sea creatures could be seen," wrote Roman historian Ammianus Marcellus, awed at a tsunami that struck the then-thriving port of Alexandria in 365 A.D.