Poseidonia
Poseidonia was the original name for the Roman city of Paestum, situated south of Naples, founded by Greek colonists around 600 BC. It was partly flooded and largely forgotten until a number of well-preserved Greek temples were rediscovered in the 18th century.
Coincidentally, the city was established in a region of southern Italy, described by Plato as being part of Atlantean territory!
Thomas Major (1720-1799), a royal engraver, visited the site in 1767 and described the ruins of Paestum in an illustrated 1768 book, The Ruins of Paestum, otherwise Posidonia, in Magna Graecia [1644].
Poseidonia, is also the name of a village on the Cycladic island of Syros.