There are only two other places in the world where you will find a cave system as massive or dramatic as the Ro Camuy Cave Park - and neither of them has a tropical underground river thundering through it! The sinkhole is believed to have once been an enormous cavern, and is indeed an impressive sight. Cathedral cave is home to an enigmatic collection of petroglyphs etched into the walls by the ancient Taínos.
The hagfish is a slime-emitting ocean-dweller that's remained unchanged for 300 million years--and it shows. It has a skull (but no spine), velvet smooth skin, and a terrifying pit of a mouth that's lined with rows of razor-sharp teeth.