The Rio Camuy Cave Park is an incredible 268-acre park that is the site of the great subterranean caverns carved out by the Camuy River over one million years ago. The impeccably maintained trails gently descend 200 feet through a fern filled ravine to the yawning, cathedral-like caverns. The caves are home to a unique species of fish that is totally blind. To visit this pristine site is to be transported to another, hidden world. Rio Camuy Cave Park is the third-largest cave system in the world. Sixteen entranced have been found and 11 kilometers (7 miles) of passages explored so far.