Besides magnificent beaches, a stunning rainforest, bio bays, etc, Puerto Rico can boast about a network of thousands of caves throughout the island.

About 140 million years of geological processes have resulted in stunning cave systems that are a delight to those who who live on the island and those who visit.

We're going to look at the top five caves to explore Puerto Rico, including the third largest Cavern system in the world with a flowing underground river.

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