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If there was one place that I knew I wanted to visit on my National Park trip, it was Thor’s Cave Peak District! I mean, who doesn’t want to visit a mysterious cave high up

Did you know there were caves in Florida? Cave diving is popular at many of the Florida springs, but Florida Caverns State Park is the only dry cave open to the public. Behind a heavy metal door awaits exploration into another world. How did these caves form? Millions of years ago, sea levels were much higher leaving a majority of the coastal areas underwater. Over the years, as sea levels fell, debris on the sea floor hardened into limestone which was dissolved by naturally acidic…

Two cavers ascend out of the 162' Neversink Pit in Alabama. Photos do not give this place justice! This photo won an honorable mention in the 2006 NSS Slide Salon. In the summer time, there are glow worms in the walls of the pit and it is best to go there on a clear, moonless night. Rappel to the bottom and sit in the middle of the pit for about 15-20 minutes with your lights off and you will see the entire pit glowing once your eyes adjust. Get on rope in the dark and ascend up the rope…

A 5-day trek through Hang Son Doong, the largest cave in the world. Located in Phong Nha-Ke Bang National Park in the Quang Binh province of Central Vietnam

For $3,000, the adventurous can journey toward the center of the earth in Hang Son Doong, the largest cave in the world.

These are the most beautiful caves around the world, which you should put on your bucket list ASAP.

Explore Alan Cressler's 42174 photos on Flickr!