not exactly a mysterious monument, but is the Atlantis story referring to the Doggersbank? I read today on the French language teletext of the TV about a study of scientists of Britain, the Netherlands and Belgium about the neolitic society of the land connecting England and the continent and found on the net this:
PS: From my childhood on I heard my parents (both fishmerchants) say: "'t is vis van de Doggersbank" (its fish from the Doggersbank) as an appreciation of good quality, and now a consortium want to put windmill parcs on it...not necessarly a bad thing for the fish... And according to my parents the soles from the Channel (de tongen van 't Kanaal) were the best...but thats all some 50 years ago...