The Springs is the only warm mineral spring in Florida. It's water has the highest mineral content of any warm springs in the world, evem more that the famous spas in Vichy and Aix les Bains in France, Baden Baden in Germany and the Hot Springs in Arkansas.
It is a water-filled, hourglass shaped sinkhole. It is about 80 yards in diameter and 230 feet deep where warm, heavily mineralized water enters from regions far below.
The Spring's 87 degree water can provide relief for muscular problems, arthritis and rheumatism. A curiosity of The Springs is that the water contains no dissolved oxygen, except at a layer of 15 or 20 feet thick at the surface, where some garfish and a few minnows manage to live.
Some say The Springs was the spot Ponce de Leon searched for, fought for and died for, believing that here, indeed, was the Fountain of Youth.
In the second photo the green plaque (which you can't read) says....
THE ORIGINAL FOUNTAIN OF YOUTH