#3 Devil’s Den Spring (Florida)
While other caverns have hidden rivers, ponds, or waterfalls, Devil’s Den Spring is a dedicated diving location. It was created by a karst window, which is simply a cave roof that falls down to reveal an ancient underground river. (The final result resembles a cenote.)
With maximum depths of 54 feet and a year-round average temperature of 72°F, the water is perfectly clear and vividly blue, allowing divers to see ancient rock formations and fossil beds that date back 33 million years.
With the right certification, scuba diving is available every day of the week; reservations are not required (if you want to dive at night, you will need an appointment). Every diver needs a dive partner. Each diver must pay $38 to enter, and equipment rentals are available. By appointment only, snorkeling is also offered; entry prices start at $15 per person, and rental gear is provided.
