Jacob's Well -- Wimberly, Tx: One of the most significant natural geologic treasures in the Texas Hill Country. It is one of the longest underwater caves in Texas and an artesian spring. Jacob’s Well surges up thousands of gallons of water per minute!
Come across this looking for things in Florida and The Grotto is on here! Can't believe I like less than 2 hours from a place that made this list. North America’s 7 Best (and Secret) Swimming Holes Lafayette Blue Springs State Park - Florida, USA