Perhaps this answers the question of what remains once civilization blows away:
[Image: “DESTIN, Fla. – A swimming pool stands alone on the beach near Destin, Fla., Monday, July 11, 2005, after having been separated from the building complex by the effects of Hurricane Dennis passing through the area on Sunday.” WFTV].
Ruined swimming pools. On stilts. A few minutes’ walk from the sea.