Calypso’s Cave on Azores?
http://homerusodyssee.nl/id27.htm
Calypso’s Cave on Gozo, Malta?
https://www.malta.com/en/attraction/natural-sites/calypso-cave
Yes, the first link is good but he just mostly compiles stuff from previous authors that wrote on the idea of the Odyssey describing places in the Atlantic. And Malta is just not in the right area at all, since it’s far too close to where Ulysses starts off on the journey.
This is the cave I’m talking about:
http://www.apia.pt/doc.php?co=118&in=0
https://www.wondermondo.com/monte-brasil-phoenician-sanctuaries/
It has natural springs with water channels cut into the rock of the cave floor, both of which are mentioned specifically in the description of Calypso’s cave. The author thinks it is merely a Phoenician worship site, and it may have been, but I think not many are considering that the Phoenicians may have just built temples on pre-existing holy sites that they were commemorating, just as the Christians did when they built their cathedrals on top of the pagan sites in Europe.