The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

A former Oz-themed attraction that has fallen into disrepair, but still holds some of the original magic.

This huge pile of volcanic boulders hides a stunning network of secret grottoes.

An enchanting natural wonder in Puerto Rico's Camuy River Park.

The world's second largest single-dish radio telescope, once used to contact E.T.

This limestone cave offers an incredible view of the Río Grande de Arecibo valley.

A magnificent waterfall nestled in the heart of the El Yunque National Forest.

This small primate research island is teeming with playing, fighting wild monkeys.