The history and folklore of Brittany contain many intriguing references to once flourishing cities that disappeared from the face of the earth, having left little or no trace of their ruins upon the land. Information on these lost cities is scarce; some seem to have been abandoned under strange circumstances while others simply vanished into myth.

The most famous of the world’s lost cities is surely Atlantis, which is said to have been consumed by the sea in a single day and night. In 1934, the French author François Gidon proposed that the Atlantis legend was born from the flooding of the coastal plains off north-west Brittany. More recently, several researchers have suggested that the megalithic monuments of Brittany are somehow connected with Atlantis. In his book The Glass Towers of Atlantis (1986), Italian scientist Helmut Tributsch expounds a theory that Neolithic Europe was Atlantis and that its capital was…