Just north of Ocala, Devil’s Den is easily one of the most unique swimming spots in the state — it’s completely underground. You enter by descending a wooden staircase into a prehistoric limestone cavern, where crystal-clear water glows aqua blue and stays 72°F year-round. The setting feels otherworldly — like something out of a movie.

Snorkelers can float and explore the cavern walls, while certified scuba divers can descend up to 54 feet into the spring, which spans about 120 feet wide. Sunlight beams through the top opening, lighting up the water and creating this magical, peaceful glow.

One of the best parts? There are no alligators here — Devil’s Den is the only spring in Florida with that distinction, but you can see fish and turtles swimming about.

That said, this is not your average swim spot. A few things to know:

• Reservations are required for both snorkeling and diving — book online before you go. No walk-ins are accepted.

• You must be a strong swimmer — life jackets, noodles, or floatation devices aren’t allowed.

• Children must be 6 or older to snorkel, and no one under 18 is allowed to dive without a certified parent or guardian.

• There’s no swimming without gear, so you’ll need to rent or bring your own snorkel equipment.

There are picnic tables and grassy areas above ground, and Cedar Lakes Woods and Gardens is located right next door — perfect for combining both into one unique day trip.