I am always surprised at the sheer volume of Atlantis "scholarship" out there.
When I was a kid the Bimini hypothesis was in vogue. It had the following unusual things to recommend it:
The Fountain of Youth (note lack of wheelchair access):
http://www.bahamasgeotourism.com/content/the-fountain-of-youth/bah56F591B3217804642
https://en.wikipedia.org/wiki/Fountain_of_Youth
The Bimini Road:
https://en.wikipedia.org/wiki/Bimini_Road
The Bimini Pyramid:
https://www.trinfinity8.com/underwater-crystal-pyramids-of-the-world/
The Bimini Crystal:
http://www.crystalinks.com/crystalpyr.html
Those amazing Blue Holes:
https://en.wikipedia.org/wiki/Blue_hole
The Bermuda Triangle (obviously some rogue Atlantean defense):
https://en.wikipedia.org/wiki/Bermuda_Triangle
And the program that started my childhood interest in Forteana on the topic:
Dear old Leonard Nimoy.
I confess it all seems a lot less credible now than it did back then with the wide eyes of childhood. These days I am more inclined to consider that "Beyond the pillars of Hercules" could easily mean the Iberian Atlantic coast. There are a number of settlements that fit the bill surprisingly well, complete with three ringed harbors. I would be more accepting of the Santorini hypothesis if someone could show how it lay beyond the pillars.
Incidentally as a trivia spot, the dollar symbol may well have been symbolically drawn from the Pillars of Hercules as depicted on Spanish currency:
https://en.wikipedia.org/wiki/Dollar_sign